Urutare rwa Lava / Ibuye ryibirunga (bakunze kwita pumice cyangwa basalt basalt) nigiciro cyinshi cyane kandi ni ubwoko bwibikorwa byo kurengera ibidukikije byakozwe nikirahure cyibirunga, imyunyu ngugu nibibyimba nyuma yo guturika kwikirunga.Ifite imyenge myinshi, uburemere bworoshye, imbaraga nyinshi hamwe nubushyuhe bwumuriro.
Nubwoko bwibuye ryagaciro kandi rifite poliporogi, kandi ryakozwe nikirahure cyibirunga, imyunyu ngugu nu mwuka mwinshi mugihe cyo guturika kwikirunga.
Harimo sodium, magnesium, aluminium, silikoni, calcium, titanium, manganese, fer, nikel, cobalt, molybdenum, hamwe nandi mabuye y'agaciro ya minerval hamwe nibintu bya trike.
Nta mirasire ifite.
Ifite intera ndende ya magnetiki, Ibuye risanzwe ryukwezi.
Igice-cyerekana, aside & alkali gihamya.
Gukurura amajwi no kubika.