Nkume dị elu pụrụ iche. E nwere ọtụtụ ụdị nkume granite n'ụwa, mana naanị okwute ole na ole ka enwere ike itinye na ngwa ziri ezi. Anyị achọọla ọtụtụ ogbunigwe sitere n'akụkụ ụwa niile ma nwalee nkume ndị kwekọrọ na ha. N'ikpeazụ, anyị hụrụ ọtụtụ nkume nwere ezigbo ihe onwunwe: Jinan Black Granite na China, mmalite: Jinan City, Shandong Province, China (naanị na Jinan City)...