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Biotite (mika y'umukara)
Biotite iboneka cyane mubutare bwa metamorphic, granite nandi mabuye.Ibara rya biotite kuva kumukara kugeza kumururu cyangwa icyatsi, hamwe nikirahure.Imiterere ni isahani hamwe ninkingi.Mu myaka ya vuba aha, biotite yakoreshejwe cyane mu gusiga irangi ryamabuye no mubindi bisize.
