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
Guomang-Co granitic mylonite, Xainza Co. (Shenzha Co.), Nagqu, Tibet, China


Locality type:Outcrop
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 Guomang-Co granitic mylonite, Xainza Co. (Shenzha Co.), Nagqu, Tibet, China
Data Identifiers
Mindat Occurrence Record ID:1702897
Long-form Identifier:1:3:1702897:0
GUID (UUID V4):0
Nearest other occurrences of Biotite
27.1km (16.8 miles) ⓘXiongmei Cu deposit, Xiongmei, Xainza Co. (Shenzha Co.), Nagqu, Tibet, China
34.8km (21.6 miles) ⓘSangri Cu deposit, Baingoin Co. (Bange Co.), Nagqu, Tibet, China
61.7km (38.3 miles) ⓘKese granite, Baingoin Co. (Bange Co.), Nagqu, Tibet, China
69.9km (43.5 miles) ⓘJiagangxueshan W-Mo-(Bi) deposit, Xainza Co. (Shenzha Co.), Nagqu, Tibet, China
71.4km (44.4 miles) ⓘGariatong Nb-Ta-Rb ore body, Xainza Co. (Shenzha Co.), Nagqu, Tibet, China
References
Zhang, Yuhe, Wang, Ming, Yu, Changsheng, Li, Zhenglong (2025) S-Type Granites from the Guomang-Co Area in Central Tibet: A Response to Early Paleozoic Andean-Type Orogeny Along the Northern Margin of East Gondwana. Minerals, 15 (3). doi:10.3390/min15030284
 
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