Ibisobanuro: Ibuye ry'ibirunga rizwi cyane nka pumice cyangwa basalt ifite imyenge, ni ubwoko bw'ibikoresho bikora kandi birengera ibidukikije. Ririmo imyunyu ngugu myinshi n'ibintu bito, nka sodium, manyeziyumu, aluminiyumu, silikoni, kalisiyumu, titaniyumu, manganese, icyuma, nikeli, kobalti na molibdenum n'ibindi.

Ikoreshwa: ubwubatsi, kubungabunga amazi, gusya, ibikoresho biyungurura, barbecue karubone, imiterere y'ahantu nyaburanga, ubuhinzi butagira ubutaka, imitako n'indi mirima.

Ibara: umutuku, umukara. umweru
Ingano: 3-6mm, 6-8mm, 8-10mm, 1-3cm, 3-6cm, 6-8cm, 8-10cm, 10-50cm bishobora guhindurwa. Imiterere: ibuye, agace gato, ifu.