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
Hengxingcuo Cu-(Mo) deposit, Karuo District, Qamdo Prefecture (Changdu Prefecture), Tibet, China


Locality type: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 Hengxingcuo Cu-(Mo) deposit, Karuo District, Qamdo Prefecture (Changdu Prefecture), Tibet, China
Data Identifiers
Mindat Occurrence Record ID:1689877
Long-form Identifier:1:3:1689877:0
GUID (UUID V4):0
Nearest other occurrences of Biotite
30.3km (18.8 miles) ⓘBaomai porphyry Cu-Mo deposit, Karuo District, Qamdo Prefecture (Changdu Prefecture), Tibet, China
37.0km (23.0 miles) ⓘYulong Cu-(Mo) deposit, Jomdo Co. (Jiangda Co.), Qamdo Prefecture (Changdu Prefecture), Tibet, China
39.0km (24.3 miles) ⓘZhanaga Cu-(Mo) deposit, Karuo District, Qamdo Prefecture (Changdu Prefecture), Tibet, China
57.4km (35.6 miles) ⓘMangzong Cu-(Mo) deposit, Karuo District, Qamdo Prefecture (Changdu Prefecture), Tibet, China
64.6km (40.1 miles) ⓘDuoxiasongduo Cu-(Mo) deposit, Karuo District, Qamdo Prefecture (Changdu Prefecture), Tibet, China
74.8km (46.5 miles) ⓘMalasongduo Cu-Mo deposit, Zhag'yab Co. (Chaya Co.), Qamdo Prefecture (Changdu Prefecture), Tibet, China
References
Zhao, Xiaoyan; Zheng, Yuanchuan; Liu, Chang; Yang, Zhusen; Dong, Yanrui; Liu, Jinchao (2025) Magmatic characteristics and oxygen fugacity variations in the Eocene Yulong porphyry copper belt. Ore Geology Reviews, 178. doi:10.1016/j.oregeorev.2025.106459
 
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