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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
March 5 Youth Cu-Mo Mine, Chunggang County, Chagang Province, North Korea


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 March 5 Youth Cu-Mo Mine, Chunggang County, Chagang Province, North Korea
Data Identifiers
Mindat Occurrence Record ID:1526968
Long-form Identifier:1:3:1526968:9
GUID (UUID V4):0
Nearest other occurrences of Biotite
19.4km (12.0 miles) ⓘDongbaligou Au deposit, Jiangyuan District (Hunjiang Co.), Baishan, Jilin, China
22.7km (14.1 miles) ⓘDahenglu Mine, Hunjiang District, Baishan, Jilin, China
35.9km (22.3 miles) ⓘFuxingcun Au deposit, Hunjiang District, Baishan, Jilin, China
39.9km (24.8 miles) ⓘNancha Au deposit, Hunjiang District, Baishan, Jilin, China
83.2km (51.7 miles) ⓘErmi Cu deposit, Tonghua Co., Tonghua, Jilin, China
87.6km (54.4 miles) ⓘShipenggou Au deposit, Tonghua, Jilin, China
91.0km (56.5 miles) ⓘTianhexing porphyry CuMo deposit, Jingyu County, Baishan, Jilin, China
91.5km (56.9 miles) ⓘChibaisong Cu-Ni-PGE deposit, Tonghua Co., Tonghua, Jilin, China
References
Keevil, Halley A.; Monecke, Thomas; Goldfarb, Richard J.; Feng, Tao (2022) Metallogeny of the Hunjiang basin, northeastern North China block. Ore Geology Reviews, 148. p.104995. doi:10.1016/j.oregeorev.2022.104995
 
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