... Description:GC-GPA is a green, friable, medium bulk density silicon carbide abrasive grain. To get this kind of grains, we ... . As loose grains, it is widely used for polishing none-metal material like ceramic, glass, stone, agates, jades and jewels. ... %Fe2O3 0.12%Physical Properties:Color GreenShape AngularCrystal Form Alpha silicon carbide in hexagonal systemSpecific Gravity 3.20Hardness HV3280-3400, 9 ...