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
Mangla lithocap, Gê'gyai Co. (Geji Co.), Ngari, Tibet, China


Locality type:Prospect
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 Mangla lithocap, Gê'gyai Co. (Geji Co.), Ngari, Tibet, China
Data Identifiers
Mindat Occurrence Record ID:1799795
Long-form Identifier:1:3:1799795:3
GUID (UUID V4):0
Nearest other occurrences of Biotite
21.9km (13.6 miles) ⓘZhule prospect, Gê'gyai Co. (Geji Co.), Ngari, Tibet, China
86.6km (53.8 miles) ⓘKenbale, Gê'gyai Co. (Geji Co.), Ngari, Tibet, China
89.9km (55.9 miles) ⓘXiongba Formation, Gê'gyai Co. (Geji Co.), Ngari, Tibet, China
94.0km (58.4 miles) ⓘGa'erqiong Cu-Au deposit, Gê'gyai Co. (Geji Co.), Ngari, Tibet, China
94.4km (58.6 miles) ⓘGalale Cu-Au deposit, Gê'gyai Co. (Geji Co.), Ngari, Tibet, China
References
Wang, Nan; Tang, Juxing; Liu, Zhibo; Song, Yang; Dai, Jingjing; Li, Baolong; Ma, Xudong; Li, Zhijun; Yan, Xukun; Sun, Qingfei (2025) Identification of the first high-sulfidation epithermal ore-bearing lithocap in the western section of the Gangdese metallogenic belt and its significance. Ore Geology Reviews, 186. 106885 doi:10.1016/j.oregeorev.2025.106885
 
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