Despite having a similar appearance to black onyx, black agate has unique qualities that make it a worthwhile purchase for those who enjoy gemstones. It differs from black onyx in terms of both physical and chemical makeup. Chalcedony, or black agate, is a member of the quartz family and is recognized for having a finely grained microcrystalline structure. In contrast to black onyx, a kind of cryptocrystalline quartz, black agate often has a waxy shine and is translucent.
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