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
Langdu Mine (Langdou Mine), Shangri-La County, Dêqên Autonomous Prefecture, 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 Langdu Mine (Langdou Mine), Shangri-La County, Dêqên Autonomous Prefecture, Yunnan, China
Data Identifiers
Mindat Occurrence Record ID:1916619
Long-form Identifier:1:3:1916619:5
GUID (UUID V4):0
Nearest other occurrences of Biotite
10.4km (6.5 miles) ⓘHongniu-Hongshan Cu deposit, Shangri-La County, Dêqên Autonomous Prefecture, Yunnan, China
11.3km (7.0 miles) ⓘHongshan section, Hongniu-Hongshan Cu deposit, Shangri-La County, Dêqên Autonomous Prefecture, Yunnan, China
13.5km (8.4 miles) ⓘPulang Cu deposit (Xuejiping Cu deposit), Shangri-La County, Dêqên Autonomous Prefecture, Yunnan, China
44.7km (27.8 miles) ⓘZhujiding Cu deposit, Xiangcheng Co., Garzê Autonomous Prefecture (Ganzi Autonomous Prefecture), Sichuan, China
70.6km (43.9 miles) ⓘDonglufang Mo-Cu deposit, Shangri-La County, Dêqên Autonomous Prefecture, Yunnan, China
References
Mo, Lei; Leng, Chengbiao; Gao, Hongze; Li, Kaixuan; Chen, Xilian; Wang, Yanjun; Dong, Tao; Luo, Wanquan; Yu, Haijun (2026) Geochemical Compositions of Zircon and Apatite from the Langdu Intrusions in the Zhongdian Arc: Implications for Porphyry–Skarn Cu Mineralization. Minerals, 16 (4). 413 doi:10.3390/min16040413
 
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