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I-Biotite (i-black mica)
I-Biotite ivela kakhulu kumatye e-metamorphic, i-granite kunye namanye amatye.Umbala we-biotite uvela kumnyama ukuya kumdaka okanye eluhlaza, kunye ne-glass luster.Ubume ipleyiti kunye nekholomu.Kwiminyaka yakutshanje, i-biotite isetyenziswe ngokubanzi kwipeyinti yamatye kunye nezinye iingubo zokuhlobisa.
