Vote for your favorite mineral in #MinCup26! - Quartz vs. Asagiite
It's a classic vs a newbie as the most common named mineral in the crust Quartz is up against an exceedingly-rare sea foam-green mineral discovered just a few years ago Asagiite.
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Biotite from
Baoxingchang ore block, Machangqing Mine, Machangqing Cu-Mo-Au ore field (Baoxingchang Cu-Mo-Au ore field), Midu County, Dali, Yunnan, China


Locality type:Ore Deposit
Classification
Species:'Biotite' (not an IMA approved species)
Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Baoxingchang ore block, Machangqing Mine, Machangqing Cu-Mo-Au ore field (Baoxingchang Cu-Mo-Au ore field), Midu County, Dali, Yunnan, China
Data Identifiers
Mindat Occurrence Record ID:726009
Long-form Identifier:1:3:726009:4
GUID (UUID V4):0
Nearest other occurrences of Biotite
1.4km (0.9 miles) ⓘMachangqing Mine, Machangqing Cu-Mo-Au ore field (Baoxingchang Cu-Mo-Au ore field), Midu County, Dali, Yunnan, China
2.1km (1.3 miles) ⓘLuandongshan ore block, Machangqing Mine, Machangqing Cu-Mo-Au ore field (Baoxingchang Cu-Mo-Au ore field), Midu County, Dali, Yunnan, China
3.3km (2.1 miles) ⓘShuangmacao Au deposit, Machangqing Cu-Mo-Au ore field (Baoxingchang Cu-Mo-Au ore field), Midu County, Dali, Yunnan, China
8.3km (5.2 miles) ⓘJinchangqing ore block, Machangqing Mine, Machangqing Cu-Mo-Au ore field (Baoxingchang Cu-Mo-Au ore field), Midu County, Dali, Yunnan, China
69.2km (43.0 miles) ⓘJinbaoshan Pt-Pd-Ni-Cu deposit (Jingbaoshan Pt-Pd-Ni-Cu deposit), Midu County, Dali, Yunnan, China
72.3km (44.9 miles) ⓘBijiashan Mine, Beiya Au-Cu ore field, Heqing County, Dali, Yunnan, China
74.2km (46.1 miles) ⓘBeiya Au-Cu ore field, Heqing County, Dali, Yunnan, China
74.8km (46.5 miles) ⓘWandongshan Mine, Beiya Au-Cu ore field, Heqing County, Dali, Yunnan, China
81.3km (50.5 miles) ⓘYao'an Au-Ag deposit, Yao'an County, Chuxiong, Yunnan, China
85.5km (53.1 miles) ⓘAlin Au deposit, Shuixie Cu–Co ore field, Yongping County, Dali, Yunnan, China
References
Liangsheng Ge, Yilin Zou, Zhenhua Li, Xiaodong Gue, Junbing Xing, and Xiaohui Zhang (2002): Geology and Prospecting 38(5), 11-17
Shaoming Wang and Zhengzhong He (2007): Yunnan Geology 26(3), 289-297
He, Wenyan; Yang, Liqiang; Sun, Nuo; Wang, Huaqing; Zhang, Ruirui; Zhang, Shaoying (2025) Magmatic-hydrothermal fluid evolution and genesis of the Machangqing porphyry Cu-Mo deposit, western Yunnan, China: Constraints from fluid inclusion and H-O-S isotopes. Ore Geology Reviews, 185. 106812 doi:10.1016/j.oregeorev.2025.106812
 
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