Chicken-blood stone occurrence, exploited since Ming dynasty, six hundred years ago. Now the vein has been exhausted.
Ref.:
- Zong-Ting Liao, Zheng-Yu Zhou, and Ying Teng (2004): Mineral Composition of "Di" of Changhua Chicken-blood Stone and Influence on Quality. Journal of Tongji University (Natural Science) [Tongji Daxue Xuebao (Ziran Kexueban)] 32(7), 897-900.
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http://www.cst.cmich.edu/users/dietr1rv/chickenblood.htm4 entries listed. 2 valid minerals.