Mubice bya minerval bigizwe na granite, hejuru ya 90% harimo feldspar na quartz, muribyo feldspar ni byinshi.Feldspar ikunze kuba umweru, imvi, ninyama-umutuku, naho quartz ahanini itagira ibara cyangwa ibara ryera, bigize ibara ryibanze rya granite ....
Soma byinshi