Industrial Grade Quartz Lump comes in the sizes of 100 meshes, 200 meshes, 300 meshes, and 500 meshes. The Quartz Lump is made up of a lattice of silica tetrahedral. The Quartz Lump is required for varied industrial applications. The Industrial Grade Quartz Lump has a hardness of 7 on the Mohs scale and a density of 2.65 g/cm.