White Quartz or Transparent Quartz, also called Rock Crystal, is a variety of colorless crystalline quartz. It is composed of silicon dioxide, belongs to the group of silicates-tectosilicicates, and its hardness is 7 on the Mohs scale. Quartz crystals are usually shaped like a hexagonal prism with pyramidal faces at their ends. They can be isolated at double tip or in clusters forming maclas, drusas or geodes.
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