Black Onyx is a solid black-colored variety of Onyx. It has parallel layers in its structure and straight bands. It has a hardness of 7 on the Mohs scale of hardness and a specific gravity of 2.57 to 2.64. It has the same Silicon Dioxide composition as other varieties of Quartz. It is an opaque gemstone with no reflection on the light. Like other varieties of onyx, it has a trigonal crystal system with a waxy luster.
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