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It's a showdown with rare earth elemental ore Monazite-(Ce) and index mineral Andalusite.
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Biotite from
Chenjiamiao Fe-Cu deposit, Zhangjiachuan Co., Tianshui, Gansu, 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 Chenjiamiao Fe-Cu deposit, Zhangjiachuan Co., Tianshui, Gansu, China
Data Identifiers
Mindat Occurrence Record ID:755924
Long-form Identifier:1:3:755924:2
GUID (UUID V4):0
Nearest other occurrences of Biotite
21.3km (13.2 miles) ⓘWangdian deposit, Zhangjiachuan Co., Tianshui, Gansu, China
53.2km (33.1 miles) ⓘBanpo pluton, Maiji District, Tianshui, Gansu, China
56.3km (35.0 miles) ⓘTailu pluton, Maiji District, Tianshui, Gansu, China
86.0km (53.4 miles) ⓘYindongxia Gorge, Dasanguan Village, Shennong Town, Weibin District, Baoji, Shaanxi, China
92.7km (57.6 miles) ⓘLizi Au deposit, Qinzhou District, Tianshui, Gansu, China
92.9km (57.7 miles) ⓘLiushaogou Au deposit, Hui Co., Longnan, Gansu, China
98.8km (61.4 miles) ⓘHuayagou Au deposit, Liangdang Co., Longnan, Gansu, China
References
Chuanzhi Luo (1989): Geology and Prospecting 25(9), 12-16, 45
 
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