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Clear as rock crystal, its color is purple but uneven. Zhang Zhongjing treats wind-heat-induced convulsions (feng re chou) and convulsions caused by fright epilepsy (jing xian chou) using Fengyin Tang: Zhi Shiying (Fluorite), Bai Shiying (White Fluorite), Hanshuishi (Cold Water Stone), Shigao (Gypsum Fibrosum), Ganjiang (Dried Ginger), Dahuang (Rhei Radix et Rhizoma), Longchi (Dragon Tooth), Muli (Ostrea Shell), Gancao (Licorice Root), Huashi (Talcum), each in equal parts. Mix them, crush into coarse particles (pronunciation note: Wu Ru Qie), and (pronunciation note: Zi Yu Qie). Add one sheng of water, decoct until reduced by one-third. After meals, take a suitable amount warm, without the dregs; there is no case where it fails to be effective.

Its shape resembles Zhi Shiying, but slightly larger, with six facets, white in color like rock crystal. Both Zhi Shiying and Bai Shiying can be temporarily boiled for their juice when treating diseases, but long-term consumption has not been heard to bring benefits. Zhang Zhongjing's intention was only to crush the herbs into coarse particles rather than grind them into fine powder; surely there is a deeper meaning here. Regarding long-term use, one should be more cautious and deliberate.

Nowadays, they are found everywhere. When licked with the tongue, those that stick well are considered superior. Someone suffered from cold and slipping of the large intestine (da chang han hua) and seminal emission during urination (xiao bian jing chu). Various warming medicines were taken totaling one dou two sheng, yet with little effect. Later, someone advised taking Chishizhi (Red Halloysite) and Ganjiang (Dried Ginger) each 1 liang, and Hujiao (Black Pepper) 0.5 liang, ground together into powder, formed into pills the size of paulownia seeds using vinegar paste. Taken on an empty stomach and before meals with rice drink, 50-70 pills per dose. After four courses of treatment, he recovered.

For infants under one month old who cry excessively causing bleeding from the umbilicus, applying fine powder of Baishi Zhi (Halloysite Alba) externally cures it immediately. If not cured, lightly stir-fry it, let it cool, then apply again, ensuring the wound is not peeled or disturbed.

"Shi Zhong Huang Zi" contains a character error here; "Zi" should be "Shui". Furthermore, the entry itself states it is unformed, turbid yellow water resembling Yuliang, so how could it be named "Zi"? Even if referring to the un-dried state, it cannot be called "Zi". The character "Zi" is undoubtedly a corruption of "Shui". It is also said to be Taiyi Yuliang, which refers to the stone aspect. Currently, physicians using Shi Zhong Huang only utilize the dried part within the stone and its fine powder, which is correct. If using Yu Yuliang Shi (Yu Yuliang Stone), one uses its shell. Therefore, this entry mentions another name "Shi Nao", requiring firing in fire and quenching in vinegar. Thus, Shi Zhong Huang Shui is one category, Shi Zhong Huang is another, and Taiyi Yuliang is a third; this distinction is unquestionable.