Soft stuth
Calcite, dolamait, Kaolin, Barite, èiteag, talc, Zircon Sannda, Wollastonite, gual a Ghlanadh, Sgòthan calcium carbonate, mica, Bauxite, Attapulgite, Brucite, Bentonite, Garnet, Magnesite, Andalusite, Pyrophyllite, Potassium feldspar, Diopside, Rectorite, Diatomite , 'chailc, Pearlite etc.
Hard stuth
Carborundum, Boron carbide, White Corundum, Zirconia, Cerium OGSAID, Àrd-Teòthachd Alumina, Silicon Nitride, Boron Nnitride, Brown suaineadh Alumina etc.
Ionnsaich barrachd