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Inclusions of copper
Usually green
The black color is often due to the presence of iron impurities within the crystal structure
Onyx is a variety of chalcedony
Dragon Tooth Amethyst Large Selenite Inclusions of copperAmethyst is a purple variety of quartz that gets its color from irradiation and inclusions of iron in the crystal lattice. Amethyst has been prized for thousands of years as a gemstone, commonly being used in jewelry. Ancient Greeks believed that amethyst prevented the intoxicating effects of alcohol. Amethyst was considered a precious gem until the 18th century when large deposits were discovered in South America. Its Mohs hardness is 7. You will
