Quartz

Minerals of the quartz family have been around since ancient times and is is one of the most abundant mineral 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.

Quartz
This particular piece of quartz was found in Galena, Mexico. 

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Howard Fensterman Minerals