Nkọwa: Nkume mgbawa ugwu nke a na-akpọkarị nkume pumice, nkume basalt, ma ọ bụ nkume lava, ọ bụ ụdị ihe na-arụ ọrụ na gburugburu ebe obibi.Ọ nwere ọtụtụ mineral na microelements, dị ka sodium, magnesium, aluminum, silicon, calcium, titanium, manganese, iron, nickel, cobalt na molybdenum na ndị ọzọ.nke a na-ejikarị eme ihe n'ubi, ala, mgbidi, osisi, ụlọ ọrụ acqurium. .

Volcanic nkume Size: 3-6mm,6-8mm,8-10mm,1-3cm,3-6cm,6-8cm,8-10cm,10-50cm nwere ike ahaziri.
ugwu mgbawankumeagba: uhie, nwa.
ugwu mgbawankumeỤdị: akpụ, urughuru, ntụ ntụ, mpempe akwụkwọ