Txhais: Ib hom sedimentary ob chav hniav mining tshuab rau quarry pob zeb tsuas yog tsim los ntawm cov zaub mov thiab pob zeb hais (particle loj 0.06-2mm) thiab muaj ntau tshaj 60 feem pua silica. Nws muaj cov qauv ntxeem tau tsim los ntawm agglomeration ntawm silica, hlau oxide, carbonate los yog av nplaum.
Kev faib tawm:
Kev lag luam, nws tsuas yog xaim pom tshuab muab faib ua xiav-txiv qaub sandstone, xim av sandstone, ortho-quartz sandstone, quartzite, gravel, siltstone.
Sandstone: silica marble thaiv tshuab cov ntsiab lus yog 60-90 feem pua .
Zoo Quartz: silica choj txiav tshuab cov ntsiab lus yog 90-95 feem pua .
Quartzite: Cov ntsiab lus silica ntug cutter yog siab dua 95 feem pua.
