Biotite (black mica)
rondedzero yechigadzirwa
Iyo imwe kristaro yebiotite ipfupi columnar uye ndiro-yakaumbwa, ine hexagonal muchinjiko chikamu uye scaly aggregate.Brown kana dema.Muvara unova wakasviba nekuwedzera kwesimbi.Mamwe maoptical uye mechanical properties akafanana neaya emuscovite, ane hukama hwepakati hwe 2.7-3.3.
Nyora meseji yako pano uye titumire kwatiri