Itshe lentaba-mlilo (elivame ukwaziwa ngokuthi i-pumice noma i-basalt enezimbobo) liyinto esebenzayo futhi enobungani nemvelo, okuyitshe eliyigugu kakhulu elinezimbobo elakhiwe yingilazi yentaba-mlilo, amaminerali, kanye nama-bubble ngemva kokuqhuma kwentaba-mlilo. Itshe lentaba-mlilo liqukethe amaminerali amaningi kanye nezinto ezilandelanayo ezifana ne-sodium, i-magnesium, i-aluminium, i-silicon, i-calcium, i-titanium, i-manganese, insimbi, i-nickel, i-cobalt, ne-molybdenum. Alinamiseli futhi linamagagasi kazibuthe akude kakhulu. Ngemva kokuqhuma kwentaba-mlilo okunonya, ngemva kweminyaka eyizinkulungwane ezingamashumi, abantu bayaqhubeka bethola inani lalo. Manje selikhulise amasimu alo okusetshenziswa emikhakheni efana nokwakha izakhiwo, ukugcinwa kwamanzi, ukugaya, izinto zokuhlunga, amalahle e-barbecue, ukuhlobisa insimu, ukulima okungenanhlabathi, kanye nemikhiqizo yokuhlobisa, lidlala indima engenakuphikwa ezimbonini ezahlukene.

I-Basalt uhlobo lwedwala eliyisisekelo le-volcanic, oluwuhlobo lwedwala elincane noma elinesakhiwo se-foam elakhiwe yi-magma evela e-volcano ngemva kokupholisa ebusweni. Lingowedwala le-magmatic. Isakhiwo salo sedwala sivame ukubonisa izakhiwo ze-stomatal, ezifana ne-almond, kanye ne-porphyritic, ngezinye izikhathi ezinamakristalu amakhulu amaminerali. I-basalt engagugi imnyama kakhulu futhi ingwevu, futhi kukhona nomnyama onsundu, onsomi omnyama, kanye nohlaza oluhlaza okotshani.

I-basalt enezimbobo (i-pumice), ngenxa yobukhulu bayo obuphezulu kanye nokuqina okukhulu, ingaxutshwa nokhonkolo ukuze yehlise isisindo sayo, kodwa isaqinile futhi inezici ezifana nokuvikela umsindo kanye nokuvikela ukushisa. Iwuhlobo oluhle lwekhonkrithi elula ezakhiweni eziphakeme. I-pumice iseyinto enhle yokugaya, engasetshenziswa ukugaya izinto zensimbi nezetshe; Embonini, ingasetshenziswa futhi njengezihlungi, izinto zokomisa, izinto zokukhulisa, njll. Amathayili etshe lentaba-mlilo ochwepheshe ayathengiswa.