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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
Tenryuu river alluvials (Tenryugawa), Hamamatsu City, Shizuoka Prefecture, Japan


Locality type:Alluvials
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 Tenryuu river alluvials (Tenryugawa), Hamamatsu City, Shizuoka Prefecture, Japan
Data Identifiers
Mindat Occurrence Record ID:917292
Long-form Identifier:1:3:917292:0
GUID (UUID V4):0
Nearest other occurrences of Biotite
38.3km (23.8 miles) ⓘOoi river alluvials (Ooikawa; Oikawa), Shimada City, Shizuoka Prefecture, Japan
43.8km (27.2 miles) ⓘShidara Volcanic field, Shinshiro city, Aichi Prefecture, Japan
51.1km (31.8 miles) ⓘMiyazaki-cho, Okazaki City, Aichi Prefecture, Japan
56.8km (35.3 miles) ⓘTaguchi mine, Shitara, Kitashitara County, Aichi Prefecture, Japan
61.2km (38.0 miles) ⓘTakakusayama District, Shizuoka City, Shizuoka Prefecture, Japan
73.8km (45.8 miles) ⓘNakakouchi-gawa area, Aoi Ward, Shizuoka City, Shizuoka Prefecture, Japan
93.7km (58.2 miles) ⓘFuji river alluvials (Fujikawa bridge), Fujikawa-cho, Fuji City, Shizuoka Prefecture, Japan
98.5km (61.2 miles) ⓘTono mine (Tohno mine), Tsukiyoshi uranium ore deposits, Mizunami City, Gifu Prefecture, Japan
References
Analyses by Dr Hideki Masago, JAMSTEC.
 
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