Volcanic pob zeb (feem ntau hu ua pumice lossis porous basalt) yog cov khoom siv ua haujlwm thiab ib puag ncig tus phooj ywg, uas yog cov pob zeb muaj nuj nqis heev uas tsim los ntawm volcanic iav, minerals, thiab npuas tom qab hluav taws kub tawg.Volcanic pob zeb muaj ntau ntau cov zaub mov thiab kab kawm xws li sodium, magnesium, txhuas, silicon, calcium, titanium, manganese, hlau, npib tsib xee, cobalt, thiab molybdenum.Nws tsis yog hluav taws xob thiab muaj cov kab hluav taws xob sib nqus infrared.Tom qab lub roob hluav taws uas tsis muaj kev hlub tshua, tom qab kaum tawm txhiab xyoo, Tib neeg tab tom nrhiav nws tus nqi ntau dua.Tam sim no nws tau nthuav dav nws daim ntawv thov rau thaj chaw xws li kev tsim vaj tsev, kev txuag dej, kev sib tsoo, cov ntaub ntawv lim, barbecue charcoal, kev tsim kho vaj tse, kev cog qoob loo tsis muaj av, thiab cov khoom siv ornamental, ua lub luag haujlwm tsis tuaj yeem hloov pauv hauv ntau yam lag luam.

Basalt yog ib yam ntawm cov pob zeb Volcanic, uas yog ib hom ntawm compact los yog ua npuas ncauj qauv pob zeb tsim los ntawm magma los ntawm lub roob hluav taws tom qab txias rau saum npoo.Nws belongs rau magmatic pob zeb.Nws cov qauv pob zeb feem ntau nthuav tawm cov pob zeb, almond zoo li, thiab cov qauv porphyritic, qee zaum nrog cov pob zeb loj loj.Unweathered basalt feem ntau yog xim dub thiab grey, thiab tseem muaj xim av dub, tsaus ntshav, thiab greyish ntsuab.

Porous basalt (pumice), vim nws qhov porosity siab thiab hnyav hnyav, tuaj yeem sib xyaw nrog pob zeb kom txo tau nws qhov hnyav, tab sis nws tseem muaj zog thiab muaj cov yam ntxwv xws li suab rwb thaiv tsev thiab rwb thaiv tsev kub.Nws yog ib qho zoo sib xyaw rau cov pob zeb sib sib zog nqus hauv cov tsev siab.Pumice tseem yog cov khoom sib tsoo zoo, uas tuaj yeem siv rau kev sib tsoo cov ntaub ntawv hlau thiab pob zeb;Hauv kev lag luam, nws kuj tseem siv tau los ua cov lim dej, tshuab ziab khaub ncaws, catalysts, thiab lwm yam.Professional ntuj volcanic pob zeb vuas lava thiab basalt pob zeb muag.