Isicelo:Ukususa ubumdaka obubuthathaka bemagnethi kwimathiriyeli ecolekileyo kunye nerhabaxa yomgubo, isetyenziswe ngokubanzi kwi-ceramic, iglasi, iikhemikhali, ishishini elichasayo njalo njalo. Ngeli xesha ingasetyenziselwa ukusetyenzwa kwe-hematite, i-limonite ect, iiminerali ezinozibuthe ezibuthathaka.