Minerals of the quartz family have been around since ancient times and is one of the most abundant minerals in the Earth’s crust. Today, it is most commonly found in jewelry and hardstone carvings.

Tibet Quartz
Photographer: Кварцов кристал намерен в Тибет. Under Creative Commons http://commons.wikimedia.org/wiki/File:Quartz,_Tibet.jpg

It’s chemical make up is SiO4 silicon–oxygen tetrahedra.

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Howard Fensterman Minerals