Quartz

: For other uses of this word, see Quartz (disambiguation).

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Quartz is the most abundant mineral in the Earth's continental crust. It has a hexagonal crystal structure made of trigonal crystallized silica (silicon dioxide, SiO2), with a hardness of 7 on the Mohs scale. Density is 2.6 g/cm³. The typical shape is a six-sided prism that ends in six-sided pyramids, although these are often twinned, distorted, or so massive that only part of the shape is apparent from a mined specimen. Additionally a bed is a common form, particularly for varieties such as amethyst, where the crystals grow up from a matrix and thus only one termination pyramid is present. A quartz geode consists of a hollow rock (usually with an approximately spherical shape) with a core lined with a bed of crystals.

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Mineral: This article is about minerals in the geologic sense; for nutrient minerals see dietary mineral; for the band see Mineral (band)....

Continental crust: The continental crust is the layer of granitic and sedimentary rock which forms the continents and the areas of shallow seabed close to their shores, known as continental shelves. It is less dense and more rigid than the material of the Earth's mantle and thus "floats" on top of it. Continental cru...

Hexagonal: REDIRECT Hexagon...

Quartz related Images and Photos (experimental)

Clear Quartz and Sterling Silver Bracelet

Close-Up of Quartz

The Quartz Mountain Lodge in Lone Wolf Oklahoma Pictured on April 30 2003

David Aubrey Long Multi Chain and Pearl Necklace with Crystal Quartz