iav yog ib qho amorphous inorganic non-metallic khoom.Nws yog feem ntau ua los ntawm ntau yam inorganic minerals (xws li quartz xuab zeb, borax, boric acid, barite, barium carbonate, limestone, feldspar, soda tshauv, thiab lwm yam) raws li lub ntsiab raw khoom, thiab ib tug me me ntawm cov ntaub ntawv raw khoom. tau ntxiv....
Nyeem ntxiv