Codsiga:Si aad uga saarto wasakhda birta ee habka qoyan oo aad nadiifiso macdanta aan birta ahayn, sida quartz, sodium ama potassium feldspar.Intaa waxaa dheer, oo leh xoojinta magnetic sare, waxay leedahay saameyn aad u wanaagsan oo lagu kala saaro macdanta magnetic daciifka ah, sida hematite, specularite, limonite, siderite, manganese ore, iwm.