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Black tourmaline is the most abundant variety of tourmaline, often called chorlo tourmaline when its crystals are hard and compact, and cathedral tourmaline when the crystals are less hard and compact.
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Amethyst is a variety of quartz of magmatic and hydrothermal origin. Its violet color is due to the iron oxide content and because it has been subjected to high temperatures in its formation. Color intensity usually concentrates on the tips of crystals and can sometimes also have milky quartz bands.
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