Ikoreshwa mugukuraho ibyuma no kweza amabuye y'agaciro atari ubutare mugutunganya amazi, cyane cyane mugukuraho ibyuma bitose biva mumabuye y'agaciro atari umucanga wa quartz, potassium feldspar, na soda feldspar.Ikindi kandi, ifite imikorere myiza yo gutandukana kubintege nke imyunyu ngugu ya magnetiki nka hematite, limonite, specularite, siderite, ubutare bwa manganese, hamwe na tantalum-niobium.