Mpempe mkpụgharị metal na-adabakarị maka ala ciment siri ike, ma ọ bụ ụlọ ọrụ mmepụta ihe nwere ike Mohs dị n'elu 6, nke nwere ike wepu ncha nke ọma site na ichicha igwe, iji gbanwee nke ọma na arụmọrụ polishing ma mee ka ala gị na-enwu gbaa ma dị nro.