Ibuye ry’ibirunga (rizwi cyane nka pumice cyangwa basalt ifite imyenge) ni ibikoresho bikora neza kandi birengera ibidukikije, rikaba ari ibuye ry’agaciro gakomeye rigizwe n’ibirahure by’ibirunga, imyunyu ngugu, n’udusimba nyuma y’iruka ry’ikirunga. Ibuye ry’ibirunga rigizwe n’imyunyu ngugu myinshi n’ibintu bike nka sodium, manyeziyumu, aluminiyumu, silikoni, kalisiyumu, titaniyumu, manganese, icyuma, nikeli, kobaltiyumu, na molybdenum. Ntirigira imirasire kandi rifite imiraba ya rukuruzi ya infrared. Nyuma y’iruka ry’ikirunga ritagira impuhwe, nyuma y’imyaka ibihumbi n’ibihumbi, abantu barimo kugenda bavumbura agaciro karyo. Ubu ryaguriye imirima yaryo mu mirima nko mu bwubatsi, kubungabunga amazi, gusya, ibikoresho byo kuyungurura, amakara ya barbecue, ubusitani, ubuhinzi butagira ubutaka, n’ibicuruzwa by’imitako, rigira uruhare rudasimburwa mu nganda zitandukanye.

Basalt ni ubwoko bw'urutare rw'ibanze rw'ibirunga, rukaba ari ubwoko bw'urutare ruto cyangwa rufite imiterere y'ifuro rugizwe na magma iva mu kirunga nyuma yo gukonja hejuru. Ni urutare rw'amabuye y'amabara. Imiterere y'urutare rwarwo ikunze kugaragaza imiterere y'imbere mu nda, nk'amande, na porphyritic, rimwe na rimwe ikaba ifite kristu nini z'amabuye y'agaciro. Basalt idahuye n'ikirere ahanini iba umukara n'ikijuju, kandi hari n'umukara w'umukara, umuhengeri wijimye, n'icyatsi kibisi cy'ikijuju.

Pumice ifite imyenge, bitewe n'uko ifite imyenge myinshi n'ubukana bukabije, ishobora kuvangwa na sima kugira ngo igabanye uburemere bwayo, ariko iracyakomeye kandi ifite imiterere nko gukingira urusaku no gukingira ubushyuhe. Ni ikintu cyiza cyo gusya sima yoroshye mu nyubako ndende. Pumice iracyari ibikoresho byiza byo gusya, bishobora gukoreshwa mu gusya ibikoresho by'ibyuma n'amabuye; Mu nganda, ishobora kandi gukoreshwa nk'ibikoresho byo kuyungurura, byumisha, catalysts, nibindi. Amatafari y'amabuye y'ibirunga y'umwuga agurishwa mu buryo bwa lava n'amabuye ya basalt.