Its countertops are made of a mix of pulverized quartz, resins, and coloring. Quartzite, however, is a metamorphic rock formed from ... Natural quartzite is white or gray, but you can find it ...

Pure quartz, or “rock crystal” from Brazil ... can even act on stray aluminum in the crystal matrix and turn it gray (smoky quartz). Natural quartz crystals usually have a long body with ...