I-volcanic rock Pumice (evame ukubizwa ngokuthi i-pumice noma i-porous basalt) iwuhlobo lwezinto ezisebenzayo zokuvikela imvelo.Kuyitshe eliyigugu kakhulu elinezimbotshana elakhiwe ingilazi yentaba-mlilo, amaminerali namabhamuza ngemva kokuqhuma kwentaba-mlilo.Itshe lentaba-mlilo liqukethe inqwaba yamaminerali kanye nezakhi zokulandelela, njenge-sodium, i-magnesium, i-aluminium, i-silicon, i-calcium, i-titanium, i-manganese, insimbi, i-nickel, i-cobalt ne-molybdenum.Inamaza kazibuthe e-infrared akude ngaphandle kwemisebe, Ngemva kwezinkulungwane zeminyaka, abantu baye bathola ukubaluleka kwayo ngokwengeziwe.Manje isidluliselwe emikhakheni yokwakha, ukongiwa kwamanzi, ukugaya, izinto zokuhlunga, amalahle ososo, ukuhlelwa kwensimu engadini, ukulima okungenamhlaba, imikhiqizo yokuhlobisa nokunye.Idlala indima engenakuthathelwa indawo kuyo yonke imikhakha yempilo!I-hot rock baking back iwuhlobo lokwelapha ngamatshe, olusebenzisa amatshe ashisayo entaba-mlilo ukuze lumunce amandla amabi emzimbeni womuntu, lusize umzimba womuntu ukhiphe ubuthi futhi lukhuthaze umzimba womuntu.