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Product Description Detailed Images Onyx is a black and white banded variety of Chalcedony, a cryptocrystalline form of Quartz with dense, fibrous layers and a hardness of 7. It is also defined as a black and white banded Agate, also a variety of Chalcedony. Onyx is formed of bands of chalcedony…
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Onyx is a black and white banded variety of Chalcedony, a cryptocrystalline form of Quartz with dense, fibrous layers and a hardness of 7. It is also defined as a black and white banded Agate, also a variety of Chalcedony.Onyx is formed of bands of chalcedony in alternating colors. It is cryptocrystalline, consisting of fine intergrowths of the silica minerals quartz and moganite. Its bands are parallel to one another, as opposed to the more chaotic banding that often occurs in agates