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Smoky quartz

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Image:USDA Mineral Smokey Quartz 93v3949.jpg Smoky quartz or Smokey quartz, also known as Cairngorm or Cairngormstone is a brown variety of quartz caused through the natural (or artificial) irradiation of aluminium-containing rock crystal. A very dark brown to black opaque variety is known as morion.

See also: List of minerals

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