Codsiga:Ka saarida wasakhda magnetic daciifka ah ee alaabta budada ah ee ganaaxa iyo kuwa aan fiicneyn, ayaa si weyn loogu isticmaalay dhoobada, galaaska, kiimikada, warshadaha dib-u-celinta iyo wixii la mid ah. Dhanka kale waxa kale oo loo isticmaali karaa in lagu farsameeyo hematite, limonite ect, macdanta magnetic liidata.