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
Tuguanzhai REE deposit, Tengchong County, Baoshan, Yunnan, 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 Tuguanzhai REE deposit, Tengchong County, Baoshan, Yunnan, China
Data Identifiers
Mindat Occurrence Record ID:1786544
Long-form Identifier:1:3:1786544:1
GUID (UUID V4):0
Nearest other occurrences of Biotite
4.8km (3.0 miles) ⓘTuganzhai iREE deposit, Lianghe County, Dehong, Yunnan, China
32.6km (20.3 miles) ⓘBaihuanao intrusion, Tengchong Sn belt, Tengchong County, Baoshan, Yunnan, China
33.5km (20.8 miles) ⓘLaopingshan Sn deposit, Tengchong Sn belt, Tengchong County, Baoshan, Yunnan, China
34.3km (21.3 miles) ⓘHuangliangou Be-Nb-Ta pegmatite deposit, Longling County, Baoshan, Yunnan, China
34.7km (21.6 miles) ⓘLailishan Sn deposit, Tengchong Sn belt, Lianghe County, Dehong, Yunnan, China
41.6km (25.9 miles) ⓘXinqi Sn-W deposit, Tengchong Sn belt, Tengchong County, Baoshan, Yunnan, China
57.2km (35.5 miles) ⓘTieyaoshan W-Sn deposit, Tengchong Sn belt, Tengchong County, Baoshan, Yunnan, China
58.9km (36.6 miles) ⓘDamanbie REE deposit, Dehong, Yunnan, China
64.4km (40.0 miles) ⓘGudong Sn deposit, Tengchong Sn belt, Tengchong County, Baoshan, Yunnan, China
73.6km (45.8 miles) ⓘXiaolonghe Sn deposit, Tengchong Sn belt, Tengchong County, Baoshan, Yunnan, China
References
Zhang, Bin; Niu, Haobin; Zhang, Linkui; Zhang, Binhui; Zhu, Xiangping; Gao, Rudong; Yang, Yongfei; Zou, Yinggui (2025) Petrographic, Geochemical, and Geochronological Characteristics of the Granite in Yunnan and Its Constraints on Ion-Adsorption Rare Earth Element Mineralization. Minerals, 15 (8). doi:10.3390/min15080872
 
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