Bayani: Dutsen Volcanic wanda aka fi sani da pumice ko basalt mai laushi, nau'in kayan aiki ne da muhalli.Ya ƙunshi dumbin ma'adanai da microelements, irin su sodium, magnesium, aluminum, silicon, calcium, titanium, manganese, iron, nickel, cobalt da molybdenum da sauransu.

Amfani: gini, kiyaye ruwa, niƙa, kayan tacewa, barbecuecarbon, gine-ginen shimfidar wuri, noman ƙasa, samfuran ado da sauran filayen.

Launi: ja, baki.fari
size: 3-6mm, 6-8mm, 8-10mm,1-3cm,3-6cm,6-8cm,8-10cm,10-50cm za a iya musamman.style: dutse, barbashi, foda.