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Noun
1. biotite; black or green mica
Wikipedia definition
2. BiotiteBiotite is a common phyllosilicate mineral within the mica group, with the approximate chemical formula K(Mg,Fe)3AlSi3O10(F,OH)2. More generally, it refers to the dark mica series, primarily a solid-solution series between the iron-endmember annite, and the magnesium-endmember phlogopite; more aluminous endmembers include siderophyllite. Biotite was named by J.F.L.
Read “Biotite” on English Wikipedia
Read “黒雲母” on Japanese Wikipedia
Read “Biotite” on DBpedia

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