Also, these materials are very fragile and extremely easy to chip or break. Imagine that many tiny hammers are breaking quartz glass little by little. That is what machining fused silica glass with diamond grinding tool is like. Machining it generates a numerous number of micro-cracks. Quartz sand screening process Quartz ore is washed and crushed into 810mm particle size, and then enters the roller grinding machine sand with a size of 0.40.1mm. Then enters the vibrating screen, and the sieved quartz sand is classified into 20 mesh, 50 mesh, 100 Mesh, 160 mesh, 200 mesh and other particle size specifications.