... the grains collide and impact each other ... and other various fields. Such as talcum, cerium oxide, pyrophyllite, chilli powder, zinc powder, iron powder, copper powder, black carbon, bentonite, boron carbide ... , molybdenum powder, limestone, zeolite powder, chromium powder, wollastonite, carborundum, potash feldspar powder, opal powder, diantimony trioxide, zirconium oxide, tungsten carbide ...