... , pigment and auxiliariesHardness : 7.5 Moh's, uneasy out of shapeDensity: 2.38g/m3 , high resistance to abrasion, compression, ... LEESTON Quartz contains approximately 93% quartz,the hardest components of natural granite,the surface is highly scratch and impact ... an inherent trait expected of LEESTON Quartz. In addition,samll blotches or random distrbution or particulates are in inherent part of ...