一名 铁石，一名吸铁石，一名玄石。
柴胡为之使。畏黄石脂。恶牡丹、莽草。伏丹砂。养水银。去铜晕。杀铁毒。消金。
辛、咸，平。入足少阴经。坠炎上之火以定志，引肺金之气以入肾。（水得金而自清，火不
攻而自伏。）除烦闷，逐
惊痫，聪耳明目。得朱砂、神曲，交心肾，治目昏内障。（磁石使精水不外遗，朱砂使邪火
不上侵。）配人参，治阳事不
起。佐熟地、萸肉，治耳聋。（相火不上，则气清而聪。）和面糊调涂囟上，治大肠脱肛。（入
后洗去。）
地榆汁煮，火 醋淬用。入肠恐致后患，纱包入药煎，但取其气为妥。
诸石有毒，不宜久用。独磁石性禀冲和，常服亦可。
一名土朱
干姜为之使。畏天雄、附子。
苦，寒。入手足厥阴经血分。镇包络之气，除血脉之热。疗崩带，止反胃吐衄，治惊痫
疳疾。得生地汁，治吐血、
衄血、下血。得冬瓜仁汤调下，治慢惊风。（泻后不乳，目黄如金。）佐半夏，蠲痰饮。 ，
醋淬七次，研，水飞过用。
气不足、津液燥者，禁用。
牡丹为之使。制五金三黄。甘，寒。重涩。入手足阳明经血分。固下焦。治烦满、症瘕、
肠泄、下痢，四肢不仁，
骨节疼痛，久远痔 。配赤石脂，治大肠咳嗽。（嗽即遗矢。）配赤石脂、牡蛎粉、乌贼骨、
伏龙
丹皮同煮，晒干用，或火 醋淬用。
[Cishi (Magnetite)]
Aliases: Tieshi (Iron Stone), Xitie Shi (Lodestone), Xuanshi.
Guiding Herb (Shi): Chaihu (Bupleuri Radix).
Contraindications: Feared by Huangshizhi (Yellow Earth Resin). Averse to Mudanpi (Moutan Cortex) and Mangcao (Acorus calamus or similar aromatic herb). Can subdue Dansha (Cinnabar). Nourishes Mercury. Removes copper rust. Kills iron toxicity. Dissolves gold.
Properties and Meridians: Acrid, Salty, Neutral. Enters the Foot-Shaoyin Kidney Meridian.
Actions and Indications: Descends floating hyperactive fire to stabilize the mind; guides Lung Metal Qi to enter the Kidney. (Principle: Water becomes clear when aided by Metal; Fire settles naturally without attack.) Eliminates vexation and oppression; expels fright and epilepsy; sharpens hearing and vision. Combined with Zhusha (Cinnabar) and Shenqu (Massa Medicata Fermentata), it communicates between Heart and Kidney, treating internal clouding of the eyes. (Principle: Cishi prevents essence from leaking outward; Zhusha prevents pathogenic fire from invading upward.) Paired with Renshen (Ginseng Radix et Rhizoma), treats impotence. Assisted by Shudihuang (Prepared Rehmanniae Radix) and Yurou (Corni Fructus), treats deafness. (Principle: When Ministerial Fire does not flare up, clear Qi ascends, resulting in acute hearing.) Mixed with flour paste and applied to the fontanelle, treats rectal prolapse. (Wash off after use.)
Processing: Decoct in Suyu juice (Sanguisorbae Radix juice), or calcine and quench in vinegar. To avoid potential adverse effects on the intestines, decoct in a gauze bag, extracting only the aroma is appropriate.
Note: Most mineral drugs are toxic and unsuitable for long-term use. Only Cishi has a mild and harmonious nature, suitable for regular use.
[Dai zheshi (Hematite)]
Alias: Tuzhu.
Guiding Herb (Shi): Jiangtan (Dried Ginger).
Contraindications: Feared by Tianxiong (Aconiti Lateralis Radix Preparata) and Fuzi (Aconiti Lateralis Radix Preparata).
Properties and Meridians: Bitter, Cold. Enters the Blood aspect of the Hand-Jueyin Pericardium and Foot-Jueyin Liver Meridians.
Actions and Indications: Calms the Qi of the Pericardium; clears heat from the blood vessels. Treats metrorrhagia and leukorrhea; stops regurgitation, hematemesis, and epistaxis; treats fright, epilepsy, and infantile malnutrition. Combined with Shengdihuang juice (Rehmanniae Radix fresh juice), treats hematemesis, epistaxis, and hematochezia. Administered with Dongguaren soup (Winter Melon Seed Decoction), treats slow convulsions. (Symptoms: Refusal to nurse after diarrhea, eyes yellow as gold.) Assisted by Banxia (Pinelliae Rhizoma), dispels phlegm-fluid retention.
Processing: Calcine seven times in vinegar, grind into powder, and process by water flotation.
Contraindications: Forbidden for those with Qi deficiency and dry fluids.
[Yuyuliang (Limonitum)]
Guiding Herb (Shi): Mudanpi (Moutan Cortex).
Function: Restricts the properties of "Five Metals" and "Three Yellows" (typically Huanglian, Huangqin, Huangbai).
Properties and Meridians: Sweet, Cold. Heavy and astringent. Enters the Blood aspect of the Hand-Yangming Large Intestine and Foot-Yangming Stomach Meridians.
Actions and Indications: Secures the Lower Jiao. Treats vexation and fullness, masses and accumulations, intestinal diarrhea, dysentery, numbness of the four limbs, joint pain, and chronic hemorrhoids. Paired with Chishizhi (Kaolin), treats "Large Intestine cough" (cough accompanied by involuntary defecation). Combined with Chishizhi, Muli (Ostrea Shell), Ougu (Sepiae Endoconcha), and Fulongdan (Long-stewed Earth), used together.
Processing: Decoct with Danpi (Moutan Cortex), sun-dry for use, or calcine and quench in vinegar.