Ingredient Mineral (矿物 kuàng wù)

Zi Shi Ying

Fluorite · 紫石英

CaF₂ (Calcium Fluoride) · Fluoritum

Also known as: Purple Fluorite, Purple Stone Radiance, Yíng Shí (萤石),

Zi Shi Ying (Fluorite) plant

Images shown are for educational purposes only

Zi Shi Ying (fluorite) is a warming mineral used in Chinese medicine to calm anxiety and heart palpitations, ease cold-type coughs, and warm the uterus in cases of difficulty conceiving due to cold. It is one of the few spirit-calming minerals that is warm rather than cold, making it uniquely suited for people whose restlessness or reproductive difficulties stem from internal cold and deficiency rather than from excess heat.

Category Substances that anchor and calm the Spirit (重镇安神药) Spirit-calming herbs (安神药)
Therapeutic focus Fertility Sleep and Anxiety Support Heart Rhythm Support Respiratory Health

TCM Properties

Temperature

Warm

Taste

Sweet (甘 gān), Acrid / Pungent (辛 xīn)

Channels entered

Heart, Liver, Lungs, Kidneys

Parts used

Mineral (矿物 kuàng wù)

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Educational content • Consult qualified TCM practitioners for diagnosis and treatment

What This Ingredient Does

Every ingredient has a specific set of actions — here's what Zi Shi Ying does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Zi Shi Ying is primarily used to support these areas of health:

Fertility Sleep and Anxiety Support Heart Rhythm Support Respiratory Health

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Zi Shi Ying performs to restore balance in the body:

Anchors and Calms the Spirit Settles tremors and palpitations Warms the Lungs and descends Qi Warms the Uterus and Dispels Cold Warms and unblocks the Chong and Ren channels

How these actions work

'Sedates the Heart and calms the spirit' refers to the herb's ability to settle an anxious or restless mind. As a heavy mineral substance, Zi Shi Ying physically weighs downward, anchoring the spirit that has become unsettled. The classical principle at work is "heaviness overcomes timidity" (重以去怯). This action applies to people who experience heart palpitations, an easily startled disposition, restless sleep, or anxiety. Its warm nature makes it especially suited to cases where the Heart is deficient in Qi rather than overheated.

'Warms the Lungs and descends Qi' means this herb addresses coughing and wheezing caused by Cold in the Lungs. When cold pathogenic factors constrict the Lungs, Qi rebels upward instead of descending normally, producing cough with thin, watery phlegm and shortness of breath. The warm, sweet nature of Zi Shi Ying counteracts this Cold and restores the natural downward movement of Lung Qi.

'Warms the uterus and dispels Cold' is the action for which this herb is perhaps most classically renowned. It directly addresses what TCM calls "Cold in the uterus" (宫寒), a condition where inadequate warmth in the lower abdomen impairs fertility, causes painful periods, or leads to excessive clear vaginal discharge. The Shen Nong Ben Cao Jing noted its use for women unable to conceive for ten years due to wind-cold settling in the uterus. By warming the Kidney Yang and reaching the Chong (Penetrating) and Ren (Conception) channels, Zi Shi Ying restores the warmth needed for conception and healthy pregnancy.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Zi Shi Ying is used to help correct these specific patterns.

Why Zi Shi Ying addresses this pattern

When Heart Blood is insufficient, the spirit (Shen) loses its anchor, resulting in palpitations, restless sleep, and an easily startled disposition. Zi Shi Ying addresses this through two mechanisms: its heavy mineral quality physically weighs the spirit downward (the classical principle of "heaviness overcomes timidity"), while its warm, sweet nature gently tonifies and nourishes the Heart. The Ben Cao Gang Mu notes that it "above, sedates the Heart" and "the Heart governs Blood," making its warming, supplementing nature well suited to Heart Blood Deficiency where coldness and emptiness allow the spirit to float unanchored.

A practitioner would look for one or more of these signs

Palpitations

Heart palpitations that worsen with fright or exertion

Insomnia

Difficulty falling or staying asleep with restless dreaming

Anxiety

Easily startled, anxious, or fearful disposition

Commonly Used For

These are conditions where Zi Shi Ying is frequently used — but only when they arise from the specific patterns it addresses, not in all cases

Arises from: Kidney Yang Deficiency

TCM Interpretation

In TCM, female infertility is frequently understood through the health of the Kidney system, which governs reproduction, and the Chong (Penetrating) and Ren (Conception) extraordinary channels, which regulate menstruation and sustain pregnancy. When Kidney Yang is deficient, the uterus lacks the warmth needed to receive and nourish an embryo. Cold settles in the "Blood Sea" and the lower burner, disrupting the normal flow of Qi and Blood through the reproductive organs. This can manifest as a cold lower abdomen, late or scanty periods with pale blood, clear vaginal discharge, and repeated failure to conceive or recurrent miscarriage.

Why Zi Shi Ying Helps

Zi Shi Ying is classically described as "the key herb for warming the uterus" (暖子宫之要药). Its warm nature and Kidney channel affinity allow it to directly supplement the Yang warmth that the reproductive system needs. Its pungent taste helps disperse the cold pathogenic factor lodged in the uterus, while its sweet taste nourishes and supports the deficient Kidney Yang. Additionally, classical texts note that it reaches and warms the Chong and Ren channels, restoring the conditions necessary for conception. It is typically combined with Blood-nourishing herbs like Dang Gui and Shu Di Huang, as well as Qi-regulating herbs like Xiang Fu, to address the full picture of cold-type infertility.

Also commonly used for

Palpitations

Heart palpitations from deficiency or fright

Anxiety

Anxiety with easily startled disposition

Irregular Menstruation

Menstrual disorders from cold in the uterus

White Vaginal Discharge

Cold-type leukorrhea

Chronic Coughing

Chronic cold-type cough with thin sputum

Wheezing

Wheezing from Lung cold

Epilepsy

Epilepsy and convulsions, as in Feng Yin Tang

Ingredient Properties

Every ingredient has an inherent temperature, taste, and affinity for specific channels — these properties determine how it interacts with the body

Temperature

Warm

Taste

Sweet (甘 gān), Acrid / Pungent (辛 xīn)

Channels Entered

Heart Liver Lungs Kidneys

Parts Used

Mineral (矿物 kuàng wù)

Dosage & Preparation

These are general dosage guidelines for Zi Shi Ying — always follow your practitioner's recommendation, as dosages vary based on the formula and your individual condition

Standard dosage

9–15g

Maximum dosage

Up to 25g in decoction under practitioner supervision for specific indications. Do not use long-term due to cumulative fluoride risk.

Dosage notes

For calming the spirit and settling palpitations (镇心安神): the raw (unprocessed) form is preferred, typically at 9-15g. For warming the Lungs and directing Qi downward, or for warming the uterus to treat cold-type infertility: the vinegar-calcined form (醋煅紫石英) is preferred, as processing enhances the warming action on the Lower Burner and Lungs while reducing fluoride content. A historical single-herb method from Zhang Wenzhong involves decocting 150g of Zi Shi Ying (crushed to bean-size pieces) in a large volume of water (approximately 2 litres), drinking the liquid gradually, and re-decocting the same stones — but this approach is not standard modern practice. Do not use at high doses or for prolonged courses due to the risk of cumulative fluoride exposure.

Preparation

Must be crushed into small pieces and decocted first (打碎先煎), typically 20-30 minutes before other herbs are added. Being a heavy mineral, it requires extended decoction time to release its active constituents into the liquid. For use in pills or powders, the traditional method is to calcine with fire and quench in vinegar (火煅醋淬) — typically repeated 2-3 times (historically up to 7 times) — then grind to fine powder and water-levitate (水飞). Modern standard processing uses 30kg of rice vinegar per 100kg of Zi Shi Ying, calcined at approximately 600°C for 30 minutes. This vinegar-calcination makes the mineral crumbly and easier to grind, reduces fluoride content, and increases bioavailable calcium.

Processing Methods

In TCM, the same ingredient can be prepared in different ways to change its effects — here's how processing alters what Zi Shi Ying does

Processing method

The raw mineral is placed in a crucible, heated in a smokeless furnace until glowing red, then quenched in vinegar. Traditionally this was repeated seven times (火煅醋淬七次), then ground to a fine powder and water-levigated (水飞). Modern standardized processing calls for heating to 600°C for 30 minutes, then quenching once with rice vinegar (30kg vinegar per 100kg of mineral).

How it changes properties

Calcining with vinegar makes the mineral crumbly and easier to grind. The vinegar (sour taste) directs the herb more strongly into the Liver and Blood level. This processing significantly reduces the fluoride content while increasing the bioavailable calcium. The processed form has a stronger ability to warm the Lungs, descend Qi, and warm the uterus compared to the raw form.

When to use this form

Use the calcined form for Lung cold with cough and wheezing, and for uterine cold with infertility or vaginal discharge. The raw (unprocessed) form is preferred when the primary goal is calming the spirit and settling palpitations, as it retains its natural smooth, moistening quality. Classical sources warn that fire processing can make the mineral more harsh, so the raw form is gentler for Heart conditions.

Common Ingredient Pairs

These ingredients are traditionally combined with Zi Shi Ying for enhanced therapeutic effect

Dang Gui
Dang Gui Zi Shi Ying 15g : Dang Gui 9-12g

Zi Shi Ying warms the uterus and dispels Cold from the lower burner, while Dang Gui nourishes and invigorates Blood. Together they address both the coldness and the Blood deficiency that often coexist in uterine cold infertility. Zi Shi Ying provides the warmth the uterus needs, while Dang Gui ensures adequate Blood supply to nourish the reproductive organs.

When to use: Female infertility from uterine cold with Blood deficiency, presenting as late periods with scanty pale blood, cold lower abdomen, and difficulty conceiving.

Zi Shi Ying
Zi Shi Ying 1:1 (both 10-25g, crushed and decocted first)

Zi Shi Ying enters the Blood level and warms the lower burner, while Bai Shi Ying (white fluorite/quartz) enters the Qi level and warms the Lungs. Used together, they address both Qi and Blood simultaneously, enhancing the ability to calm the spirit, warm the Lungs, settle rebellious Qi, and warm the lower body.

When to use: Heart and Lung insufficiency with palpitations, cough with rebellious Qi rising, and cold in the lower body. Classical texts describe the pair as exemplifying the principle of "moistening overcomes dryness" (湿可去枯).

Suan Zao Ren
Suan Zao Ren Zi Shi Ying 15g : Suan Zao Ren 15-20g

Zi Shi Ying provides heavy mineral sedation to anchor the restless spirit, while Suan Zao Ren nourishes Heart Blood and Liver Yin to give the spirit a stable foundation. The mineral heaviness of Zi Shi Ying works from outside to press the spirit downward, while Suan Zao Ren works from within to nourish the blood that houses it.

When to use: Heart Blood deficiency with insomnia, palpitations, anxiety, and an easily frightened disposition, especially when the patient also has signs of cold or deficiency rather than Heat.

Long Gu
Long Gu Zi Shi Ying 15-18g : Long Gu 15-18g

Both are heavy mineral substances that calm the spirit, but Zi Shi Ying is warm and nourishing while Long Gu is neutral and astringent. Together they provide a more comprehensive sedation: Zi Shi Ying contributes warmth to support the Heart, while Long Gu adds strong astringent anchoring and helps prevent leakage of essence.

When to use: Severe palpitations, convulsions, or epilepsy where the spirit is severely disturbed, as seen in the classical formula Feng Yin Tang from the Jin Gui Yao Lue.

Key Formulas

These well-known formulas feature Zi Shi Ying in a prominent role

Feng Yin Tang 風引湯 Envoy

Feng Yin Tang (Wind-Guiding Decoction) from the Jin Gui Yao Lue is the most prominent classical formula containing Zi Shi Ying. In this 12-ingredient formula for epilepsy and convulsions, Zi Shi Ying serves as envoy, using its warm nature to supplement the already-depleted Heart spirit while the remainder of the formula (dominated by cold, heavy minerals) clears Heat and suppresses internal Wind. Classical commentators note it "supplements the deficiency of Heart spirit" within this otherwise cooling formula, providing the necessary balance.

Comparable Ingredients

These ingredients have overlapping uses — here's how to tell them apart

Ci Shi
Zi Shi Ying vs Ci Shi

Both are heavy minerals used to calm the spirit, but they differ fundamentally in thermal nature and specific actions. Ci Shi (magnetite) is salty and cold, mainly used for Kidney-Liver patterns with Yin deficiency and Yang rising. It excels at anchoring floating Yang, benefiting hearing and vision, and helping the Kidneys grasp Lung Qi. Zi Shi Ying is sweet, pungent, and warm, making it appropriate when the restlessness comes from Heart deficiency with cold rather than from excess Yang. Zi Shi Ying also uniquely warms the uterus, an action Ci Shi does not share. Choose Ci Shi for Yin-deficient, hot patterns; choose Zi Shi Ying for cold-deficient patterns.

Long Gu
Zi Shi Ying vs Long Gu

Both calm the spirit through mineral heaviness, but Long Gu (dragon bone) is neutral in temperature and strongly astringent, with important actions in consolidating essence, stopping sweating, and restraining leakage. It is versatile across hot, cold, excess, and deficient patterns. Zi Shi Ying is warm and nourishing rather than astringent, and uniquely warms the uterus and Lungs. Long Gu is the better choice when astringency is needed (night sweats, spermatorrhea, vaginal discharge); Zi Shi Ying is preferred when warmth is the primary need (cold uterus, cold-type cough alongside palpitations).

Zhu Sha
Zi Shi Ying vs Zhu Sha

Both are heavy minerals classified under spirit-calming herbs, but Zhu Sha (cinnabar) is cold and toxic, specializing in clearing Heart Fire. It is the strongest heavy sedative for Heart Fire patterns with severe irritability and mania. Zi Shi Ying is warm and non-toxic (though mineral), making it suitable for deficiency-cold patterns. Zhu Sha should never be used long-term due to mercury toxicity, while Zi Shi Ying, although also a mineral best used short-term, does not carry the same toxic risk. Choose Zhu Sha for Heart Fire excess; choose Zi Shi Ying for Heart deficiency with cold.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Zi Shi Ying

The most important confusion is between the two historical source minerals: 1. Purple fluorite (CaF2, Mohs hardness 4, specific gravity 3.18) — the current Pharmacopoeia standard. 2. Purple quartz / amethyst (SiO2, Mohs hardness 7, specific gravity 2.65) — the historical Taishan product, still used in some areas of Sichuan and Yunnan. These can be distinguished by hardness (a steel knife scratches fluorite but not quartz), weight (fluorite is noticeably heavier), and crystal structure (fluorite forms cubes; quartz forms hexagonal prisms). Fluorite fluoresces under UV light while quartz typically does not. Commercial products may also contain non-purple fluorite (green or pale varieties) or fluorite mixed with other minerals such as sulfides and clay impurities. White or greenish fluorite lacking the characteristic purple colour is of inferior quality for medicinal use. Some products may be mixed with Bai Shi Ying (white quartz), which has different therapeutic properties.

Educational content — always consult a qualified healthcare provider or TCM practitioner before using any ingredient.

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Zi Shi Ying

Non-toxic

The Shen Nong Ben Cao Jing classifies Zi Shi Ying as non-toxic (无毒). However, because its main component is calcium fluoride (CaF2, containing approximately 48.8% fluorine), prolonged or excessive use can lead to chronic fluoride accumulation. Excess fluoride primarily damages teeth (dental fluorosis), bones (skeletal fluorosis with increased brittleness), the nervous system, kidneys, heart, and thyroid. The Ben Cao Jing Shu warns that all mineral medicines should only be used temporarily. The Ben Jing Feng Yuan cautions that "after fire-processing it becomes toxic" (经火则毒), recommending raw grinding and water-levigation instead. In contrast, the mainstream processing tradition of fire-calcination with vinegar quenching (火煅醋淬) actually reduces fluoride content while increasing bioavailable calcium, which modern analytical studies have confirmed. At standard dosages (9-15g) for short-term use in decoction, Zi Shi Ying is considered safe. The fluoride released into decoction water is relatively small due to the low water-solubility of calcium fluoride.

Contraindications

Situations where Zi Shi Ying should not be used or requires extra caution

Avoid

Yin deficiency with vigorous Fire (阴虚火旺). The warming nature of Zi Shi Ying would further deplete Yin and aggravate Heat signs. The Ben Cao Jing Shu specifically warns that infertility caused by Yin deficiency with Fire rather than cold in the uterus is a contraindication.

Avoid

Lung Heat with cough and wheezing. Since Zi Shi Ying warms the Lungs, it is inappropriate when the cough or asthma is due to Heat rather than Cold in the Lungs.

Caution

Prolonged or excessive use. As a mineral containing fluoride (CaF2), long-term consumption may cause chronic fluoride accumulation affecting teeth, bones, kidneys, heart, nervous system, and thyroid. Classical texts advise that all mineral-type medicines should only be used temporarily.

Caution

Patients with kidney impairment. Fluoride is primarily excreted through the kidneys, so compromised renal function increases the risk of fluoride accumulation and toxicity.

Classical Incompatibilities

Traditional Chinese pharmacological incompatibilities — herbs or substances to avoid combining with Zi Shi Ying

Zi Shi Ying does not appear on the standard Eighteen Incompatibilities (十八反) or Nineteen Mutual Fears (十九畏) lists. However, the Ben Cao Jing Ji Zhu (《本草经集注》) records specific traditional cautions: "Chang Shi (長石) serves as its envoy. It fears (畏) Bian Qing (扁青, azurite) and Fu Zi (附子, Aconite). It is incompatible with (不欲) Tuo Jia (鮀甲), Huang Lian (黄连, Coptis), and Mai Ju Jiang (麦句姜)."

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

No specific classical prohibition against use during pregnancy exists, but caution is strongly advised. Zi Shi Ying is a warming mineral medicine that acts on the Lower Burner and uterus. While it is traditionally used to warm the uterus to promote conception, its use during an established pregnancy is a different matter. The fluoride content (CaF2) raises concerns about fetal exposure to fluoride, which can cross the placenta and affect developing bones and teeth. Most practitioners avoid mineral medicines during pregnancy unless specifically indicated. Should only be used during pregnancy under close practitioner supervision with a clear clinical rationale.

Breastfeeding

No specific classical guidance exists for breastfeeding. The primary concern is fluoride transfer through breast milk. Fluoride from calcium fluoride has limited bioavailability in decoction, but chronic use could elevate maternal fluoride levels and thereby affect the nursing infant. Excessive fluoride exposure in infants may affect developing teeth and bones. Use at standard doses for short courses is likely of low risk, but prolonged use during breastfeeding should be avoided. Consult a qualified practitioner before use while nursing.

Children

Zi Shi Ying is not commonly used in paediatric practice. Its primary indications (uterine cold, infertility) are adult conditions. For paediatric fright-epilepsy (惊痫), classical formulas such as Feng Yin Tang do include it, but under strict practitioner guidance only. Children are more susceptible to fluoride toxicity than adults — developing teeth and bones are particularly vulnerable to excess fluoride. If used for children, dosage should be significantly reduced (typically one-third to one-half of the adult dose, adjusted by age and weight), duration should be kept short, and it must always be prescribed and monitored by a qualified practitioner.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Zi Shi Ying

No well-documented interactions with specific pharmaceutical drugs have been established through clinical studies. However, the following theoretical concerns merit attention based on Zi Shi Ying's pharmacological profile:

  • Fluoride-containing medications: Concurrent use with sodium fluoride supplements (used for osteoporosis) or fluoride-containing dental products could increase total fluoride exposure and raise the risk of fluorosis.
  • Calcium supplements and calcium-channel blockers: As a calcium fluoride mineral that releases calcium and fluoride ions in acidic environments (such as the stomach), co-administration with calcium-based medications may alter absorption dynamics. Theoretically, excess calcium could reduce fluoride bioavailability, while the additional calcium load could interact with calcium-channel blockers.
  • Thyroid medications: Chronic fluoride exposure can affect thyroid function. Patients taking levothyroxine or anti-thyroid drugs should use Zi Shi Ying with caution, as fluoride may interfere with iodine metabolism.
  • Sedatives and anxiolytics: Given its spirit-calming properties, additive sedative effects are theoretically possible when combined with benzodiazepines, barbiturates, or other CNS depressants.

Dietary Advice

Foods and dietary considerations when taking Zi Shi Ying

Avoid cold and raw foods when taking Zi Shi Ying for warming the uterus or Lungs, as these would counteract its warming therapeutic effect. Historically, the Ben Cao Jing Ji Zhu notes it "does not combine well with" (不欲) certain substances including Huang Lian (Coptis), which is very bitter and cold — by extension, excessively bitter-cold foods or drinks should be minimised during treatment. If experiencing intermittent chills and fever while taking Zi Shi Ying, classical texts suggest drinking a small amount of warm wine (alcohol) to assist its dispersing action.

Botanical Description

Physical characteristics and morphology of the Zi Shi Ying source mineral

Zi Shi Ying (紫石英) is not a plant but a mineral substance. It is the mineral fluorite (Fluoritum), belonging to the halide mineral group of the fluorite family. Its chemical formula is CaF2 (calcium fluoride). Fluorite crystallizes in the cubic crystal system, forming cubes, octahedra, and dodecahedra, though it is typically found as dense, granular masses.

The mineral occurs in hydrothermal veins and pegmatite formations, and is also found alongside lead-zinc sulfide ore deposits. In its raw state, fluorite can be colourless, yellow, green, blue, purple, or blackish-purple. The medicinal variety selected for TCM use is characteristically purple-coloured (hence the name 紫, "purple"). It has a glassy lustre, is semi-transparent to transparent, and feels slightly oily to the touch. The Mohs hardness is 4 (softer than a steel knife) and the specific gravity is 3.18, making it noticeably heavy. It displays distinctive fluorescence under ultraviolet light.

Historical note: Classical texts describe two distinct mineral forms used as Zi Shi Ying. The standard modern pharmacopoeia product is purple fluorite (CaF2). However, historical sources from Taishan (泰山) describe a harder stone with five-sided prismatic crystals resembling arrowheads, which corresponds to purple quartz (amethyst, SiO2). Some regions in Sichuan and Yunnan still use amethyst as Zi Shi Ying. The two substances differ significantly in hardness, composition, and density.

Sourcing & Harvesting

Where Zi Shi Ying is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Can be mined year-round (全年均可采挖). After extraction, purple-coloured specimens are selected and external sand, rock, and clay are removed.

Primary growing regions

Major production areas include Zhejiang, Jiangsu, Liaoning, Heilongjiang, Hebei, Hunan, Hubei, and Gansu provinces. Classically, the most prized Zi Shi Ying came from Taishan (泰山, Mount Tai) in Shandong province — Tao Hongjing stated that Taishan stone was "foremost" in quality, deeply coloured and translucent with a visible root structure. Kuaiji (会稽, modern Zhejiang) was a secondary source. The Ling Biao Lu Yi noted that Longzhou (陇州, modern Shaanxi) also produced fine specimens. Modern market supply comes primarily from Zhejiang, Gansu, and Henan. The Taishan product historically represented amethyst (purple quartz, SiO2), while the Kuaiji product was fluorite (CaF2) — only the latter matches the current Chinese Pharmacopoeia standard.

Quality indicators

Good quality Zi Shi Ying (fluorite) should be deep purple in colour, uniformly coloured without excessive pale or greenish areas. It should be semi-transparent to transparent with a distinct glassy (vitreous) lustre. Pieces should feel noticeably heavy in the hand (specific gravity 3.18). The surface may show natural fracture lines. It should be odourless with a bland taste, and feel slightly oily or smooth to the touch. The classical standard is: "Purple in colour, solid in texture, with glassy lustre and free of mixed stones" (以色紫、质坚、具玻璃光泽、无杂石者为佳). The Chinese Pharmacopoeia requires that the CaF2 content be no less than 85.0%. Under ultraviolet light (365nm), authentic Zi Shi Ying fluoresces bright purple to blue-purple, which serves as a useful identification test. Processed (vinegar-calcined) Zi Shi Ying appears as irregular broken granules, purplish-black to grey-white or ochre in colour, with a crumbly texture, dull surface (no lustre), and a faint vinegar odour.

Classical Texts

Key passages from the classical Chinese medical texts that describe Zi Shi Ying and its therapeutic uses

Shen Nong Ben Cao Jing (《神农本草经》)

Chinese: 紫石英，气味甘，温，无毒。主心腹咳逆邪气，补不足，女子风寒在子宫，绝孕十年无子。

English: Zi Shi Ying is sweet in flavour, warm in nature, and non-toxic. It treats cough and rebellious Qi with pathogenic factors in the chest and abdomen, supplements deficiency, and addresses wind-cold lodged in the uterus causing infertility even after ten years without children.

Ben Cao Gang Mu (《本草纲目》) — Li Shizhen

Chinese: 紫石英上能镇心，重以去怯也。下能益肝，湿以去枯也。心主血，肝藏血，其性暖而补，故心神不安，肝血不足及女子血海虚寒不孕者宜之。

English: Zi Shi Ying can settle the Heart above — its heaviness dispels timidity. It can benefit the Liver below — its moistening quality relieves dryness. The Heart governs Blood and the Liver stores Blood. Its nature is warming and supplementing, therefore it is suitable for restless spirit, insufficient Liver Blood, and women with cold deficiency in the Sea of Blood causing infertility.

Ben Cao Jing Shu (《本草经疏》)

Chinese: 此药填下焦，走肾及心包络，辛温能散风寒邪气，故为女子暖子宫之要药。

English: This medicine fills the Lower Burner and reaches the Kidneys and Pericardium. Its acrid-warm nature disperses wind-cold pathogenic factors, making it the key herb for warming a woman's uterus.

Chinese: 紫石英其性镇而重，其气暖而补，故心神不安，肝血不足及女子血海寒虚不孕者，诚为要药。然止可暂用，不宜久服，凡系石类皆然，不独石英一物也。

English: The nature of Zi Shi Ying is settling and heavy, its Qi is warming and supplementing. For restless spirit, insufficient Liver Blood, and women with cold-deficient Sea of Blood causing infertility, it is truly a key medicine. However, it should only be used temporarily, not taken long-term — this applies to all mineral medicines, not just Zi Shi Ying alone.

Ming Yi Bie Lu (《名医别录》)

Chinese: 疗上气，心腹痛，寒热邪气，结气，补心气不足，定惊悸，安魂魄，镇下焦，止消渴，除胃中久寒，散痈肿。

English: It treats rebellious Qi rising upward, pain in the chest and abdomen, pathogenic cold-heat factors, knotted Qi, supplements insufficiency of Heart Qi, calms fright palpitations, settles the ethereal and corporeal souls, anchors the Lower Burner, stops wasting-thirst, eliminates long-standing cold in the Stomach, and disperses abscesses and swellings.

Historical Context

The history and evolution of Zi Shi Ying's use in Chinese medicine over the centuries

Zi Shi Ying was first recorded in the Shen Nong Ben Cao Jing (circa Han Dynasty), where it was classified as a middle-grade medicine. The Wu Pu Ben Cao provides early sourcing details, noting it was collected from Taishan (Mount Tai) and Kuaiji, with the ideal specimen described as "cut-like, purple through to the tip, shaped like gaming dice" (欲令如削，紫色达头，如樗蒲者).

The name 紫石英 literally means "Purple Stone Brilliance" or "Purple Stone Radiance." The character 英 (ying) suggests lustre, radiance, or excellence. It belongs to the broader "stone" (石) category of materia medica alongside its counterpart Bai Shi Ying (白石英, White Stone Radiance), which is a white quartz variety with somewhat different therapeutic actions focusing on the Lungs.

A significant historical complication is the identity confusion between two distinct minerals. Research has confirmed that the classical Taishan product was likely purple quartz (amethyst, SiO2), while the Kuaiji product was purple fluorite (CaF2). The ancient processing instruction of "grinding for seven days" (七日研之) in the Qian Jin Yi Fang makes sense only for the much harder amethyst (Mohs 7), not for the softer fluorite (Mohs 4). The modern Chinese Pharmacopoeia recognizes only fluorite as the official source.

Zi Shi Ying was historically associated with the controversial Wu Shi San (五石散, Five Mineral Powder) popular among Wei-Jin Dynasty literati, a mineral formula taken for its stimulant effects and alleged life-extending properties. This practice was later condemned by Sun Simiao in his Qian Jin Yao Fang as a "great fierce poison." Zhang Wenzhong of the Tang Dynasty developed a simpler single-herb method of boiling Zi Shi Ying in water to calm the spirit and treat palpitations from deficiency taxation.