Pob zeb volcanic (feem ntau hu ua pumice lossis porous basalt) yog ib yam khoom siv ua haujlwm thiab zoo rau ib puag ncig, uas yog ib lub pob zeb muaj nqis heev uas tsim los ntawm cov iav volcanic, cov zaub mov, thiab cov npuas tom qab muaj hluav taws tawg. Pob zeb volcanic muaj ntau yam zaub mov thiab cov kab kawm xws li sodium, magnesium, txhuas, silicon, calcium, titanium, manganese, hlau, nickel, cobalt, thiab molybdenum. Nws tsis yog radiative thiab muaj cov nthwv dej magnetic deb-infrared. Tom qab muaj hluav taws tawg tsis muaj kev hlub tshua, tom qab kaum tawm txhiab xyoo, tib neeg tab tom pom nws tus nqi ntau zuj zus. Tam sim no nws tau nthuav nws cov teb thov rau cov teb xws li architecture, dej conservancy, sib tsoo, lim cov ntaub ntawv, barbecue thee, landscaping, soilless cultivation, thiab ornamental products, ua lub luag haujlwm tseem ceeb hauv ntau yam lag luam.

Basalt yog ib hom pob zeb Volcanic yooj yim, uas yog ib hom pob zeb compact lossis ua npuas ncauj uas tsim los ntawm magma los ntawm lub roob hluav taws tom qab txias rau ntawm qhov chaw. Nws yog ib feem ntawm pob zeb magmatic. Nws cov qauv pob zeb feem ntau muaj cov qauv stomatal, zoo li almond, thiab porphyritic, qee zaum nrog cov pob zeb loj loj. Basalt Unweathered feem ntau yog dub thiab grey, thiab kuj tseem muaj xim av dub, ntshav tsaus, thiab greyish ntsuab.

Cov pob zeb basalt uas muaj qhov me me (pumice), vim nws muaj qhov me me thiab tawv heev, tuaj yeem sib xyaw nrog cov pob zeb ua vaj tse kom txo nws qhov hnyav, tab sis nws tseem muaj zog thiab muaj cov yam ntxwv xws li kev rwb thaiv suab thiab kev rwb thaiv cua sov. Nws yog cov khoom sib xyaw zoo rau cov pob zeb sib dua hauv cov tsev siab. Pumice tseem yog cov khoom sib tsoo zoo, uas tuaj yeem siv los sib tsoo cov hlau thiab cov pob zeb; Hauv kev lag luam, nws kuj tuaj yeem siv ua cov lim dej, cov tshuab ziab khaub ncaws, cov tshuaj catalysts, thiab lwm yam. Cov pob zeb volcanic ntuj tsim kev lag luam lava thiab pob zeb basalt rau muag.