biotite
Pronunciation:
/ˈbaɪəˌtaɪt/noun
Definitions
A dark brown mica; it is a mixed aluminosilicate and fluoride of potassium, magnesium and iron.
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/ˈbaɪəˌtaɪt/Definitions
A dark brown mica; it is a mixed aluminosilicate and fluoride of potassium, magnesium and iron.