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
Bijiashan Mine, Beiya Au-Cu ore field, Heqing County, Dali, Yunnan, China


Locality type:Mine
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 Bijiashan Mine, Beiya Au-Cu ore field, Heqing County, Dali, Yunnan, China
Data Identifiers
Mindat Occurrence Record ID:1747752
Long-form Identifier:1:3:1747752:9
GUID (UUID V4):0
Nearest other occurrences of Biotite
2.3km (1.4 miles) ⓘBeiya Au-Cu ore field, Heqing County, Dali, Yunnan, China
2.5km (1.6 miles) ⓘWandongshan Mine, Beiya Au-Cu ore field, Heqing County, Dali, Yunnan, China
58.5km (36.3 miles) ⓘJinhe intrusion, Jianchuan County, Dali, Yunnan, China
71.9km (44.7 miles) ⓘLuandongshan ore block, Machangqing Mine, Machangqing Cu-Mo-Au ore field (Baoxingchang Cu-Mo-Au ore field), Midu County, Dali, Yunnan, China
72.2km (44.9 miles) ⓘShuangmacao Au deposit, Machangqing Cu-Mo-Au ore field (Baoxingchang Cu-Mo-Au ore field), Midu County, Dali, Yunnan, China
72.3km (44.9 miles) ⓘBaoxingchang ore block, Machangqing Mine, Machangqing Cu-Mo-Au ore field (Baoxingchang Cu-Mo-Au ore field), Midu County, Dali, Yunnan, China
72.7km (45.2 miles) ⓘJinchangqing ore block, Machangqing Mine, Machangqing Cu-Mo-Au ore field (Baoxingchang Cu-Mo-Au ore field), Midu County, Dali, Yunnan, China
73.7km (45.8 miles) ⓘMachangqing Mine, Machangqing Cu-Mo-Au ore field (Baoxingchang Cu-Mo-Au ore field), Midu County, Dali, Yunnan, China
References
Zhong, Yun; Yuan, Yajuan; Lu, Ye; Xia, Bin (2025) Origin and Tectonic Implication of Cenozoic Alkali-Rich Porphyry in the Beiya Au-Polymetallic Deposit, Western Yunnan, China. Minerals, 15 (5). doi:10.3390/min15050531
 
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