Please note that you should never self-prescribe TCM ingredients. A TCM ingredient is almost never eaten on its own but as part of a formula containing several ingredients that act together. Please consult a professional TCM practitioner, they will be best able to guide you.
Preparation: Crush the rock into powder
Dosage: 3 - 12 grams
Main actions according to TCM*: Purges Stagnation in the Intestines caused by Heat and Dryness, Cools Heat and abates swelling
Contraindications*: As this substance has a strong descending action, it should not be used during pregnancy, menstruation or post-partum; it should also be avoided by those with Spleen Deficiency and by the elderly.
In Traditional Chinese Medicine (TCM), mirabilites are plants that belong to the 'Purgative herbs that drain downward' category. The herbs in this category are those whose main purpose is to treat constipation. The fact they're 'purgative' means that they do so by removing excess Heat in the Intestines and/or Stomach. As such all herbs in this category are Cold in nature, in order to cool the Heat.
Furthermore mirabilites are plants that are Cold in nature. This means that mirabilites typically help people who have too much "heat" in their body. Balance between Yin and Yang is a key health concept in TCM. Those who have too much heat in their body are said to either have a Yang excess (because Yang is Hot in nature) or a Yin deficiency (Yin is Cold in Nature). Depending on your condition mirabilites can help restore a harmonious balance between Yin and Yang.
Mirabilites also taste Bitter and Salty. The so-called "five elements" theory in Chinese Medicine states that the taste of TCM ingredients is a key determinant of their action in the body. Bitter ingredients like mirabilites tend to have a cleansing action on the body by clearing heat, drying dampness and promoting elimination via urination or bowel movements. On the other hand Salty ingredients tend to have a draining effect in the body because they clear accumulations, remove phlegm and soften hard lumps.
The tastes of ingredients in TCM also determine what organs and meridians they target. As such mirabilites are thought to target the Stomach and the Large intestine. In TCM the Stomach is responsible for receiving and ripening ingested food and fluids. It is also tasked with descending the digested elements downwards to the Small Intestine. The Large Intestine on the other hand receives the "impure" parts of the digested food from the Small Intestine, absorbs the remaining fluids and excrete the remainder as feces.