Zhāng zhēn rén jīn shí líng shā lùn 張真人金石靈砂論

Perfected Zhāng’s Treatise on Metals, Minerals, and Numinous Cinnabar

by 張隱居 (Zhāng yǐn jū, fl. 742–770) — mid-Táng Daoist alchemist

A mid-Táng alchemical treatise on jīn shí 金石 (metals and minerals) with emphasis on numinous cinnabar (líng shā 靈砂). Composed in the Tiān bǎo to Dà lì reigns (742–770). Preserved as DZ 887 / CT 887 (Dòngshén bù, Zhòng shù lèi 洞神部眾術類).