Biotite inonyanya kuitika mune metamorphic rocks, granite nemamwe matombo.Rudzi rwebiotite runobva kune dema kusvika kune brown kana girini, ine girazi luster.Chimiro iplate uye column.Mumakore achangopfuura, biotite yakashandiswa zvakanyanya mupende yematombo uye mamwe machira ekushongedza.