Lechatelierite

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 2.65 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 cry ...

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• Quartz - Varieties
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Quartz is one of the world's most common crustal minerals and goes by a bewildering array of different names. The most important distinction between types of quartz is that of macrocrystalline (individual crystals visible to the unaided eye) and the microcrystalline or cryptocrystalline varieties (aggregates of crystals visible only under high magnification). Chalcedony is a generic term for cryptocrystalline quartz. The cryptocrystalline varieties are either translucent or mostly opaque, while the transparent va ...

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Quartz, Quartz - Varieties, Quartz - History, Quartz - Piezoelectricity

Read more here: » Quartz: Encyclopedia II - Quartz - Varieties

The name "quartz" comes from the German "Quarz", which is of Slavic origin. Quartz is the most common material identified as the mystical substance maban in Australian Aboriginal mythology. Roman naturalist Pliny the Elder believed quartz to be permanently frozen ice. He supported this idea by saying that quartz is found near glaciers in the Alps and that large quartz crystals were fashioned into spheres to cool the hands. He also knew of the ability of quar ...

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Quartz, Quartz - Varieties, Quartz - History, Quartz - Piezoelectricity

Read more here: » Quartz: Encyclopedia II - Quartz - History