Onyx

Onyx is a gemstone whose description can have several connotations. Its most accepted gemstone definition describes a solid black Chalcedony, or a banded or layered black and white Chalcedony. The term Onyx is occasionally used to described any engraved stone with a solid color base, or it may describe any banded gemstone with parallel banding. In its solid black form, Onyx is the most traditional black gemstone.

  • Chemical FormulaSiO2
  • ColorWhite, Black, Banded
  • Hardness7.0
  • Mineral ClassQuartz

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