Mos khoom
Calcite, Dolomite, Kaolin, Barite, Quartz, talc, zircon Sand, Wollastonite, Coal Hmoov, Lub teeb Calcium Carbonate, mica, Bauxite, Attapulgite, Brucite, Bentonite, Garnet, Magnesite, Andalusite, Pyrophyllite, poov tshuaj Feldspar, Diopside, Rectorite, Diatomite , Gypsum, Pearlite etc.
Hard khoom
Carborundum, Boron Carbide, Dawb Corundum, Zirconia, Cerium Oxide, Kub Alumina, Silicon Nitride, Boron Nnitride, Brown fused Alumina etc.
kawm ntxiv