Zǐ tuán dān jīng 紫團丹經
Alchemical Scripture of the Purple Cluster
Anonymous; Southern Sòng
A Southern-Sòng inner-alchemical (nèi dān 內丹) manual, attributed in the text to the “Zǐ tuán zhēn rén” 紫團眞人 (“Purple-Cluster Perfected”). The doctrine is heart-kidney union (xīnshèn jiāo gòu 心腎交媾) through cún shén 存神 meditation; the text explicitly cites Zhāng Bóduān’s Wù zhēn piān 悟眞篇, placing it in the Southern-Sòng Nán zōng 南宗 alchemical tradition. Preserved as DZ 878 / CT 878 (Dòngshén bù, Fāngfǎ lèi 洞神部方法類).
Dating. Southern Sòng. Dynasty: 南宋.