Onyx

Onyx is blended variety of chalcedony, a cryptocrystalline form of quartz. The colour of its bands range from white to almost every colour not included not included shades such as purple or blue. Commonly specimens of Onyx contains colour of white, tan and brown sardonyx is a variant in which the coloured bands sard shades of red than black.

Onyx banded calcite are found in Mexico, Pakistan and other place, and often carved, polished and sold. This material is much softer than true onyx, and much more readily available. The majority of carved items sold as ‘Onyx’ today are this carbonate material.