Onyx gemstone colors6/30/2023 Geological Survey (2005) Mineral Resources Data System: U.S. Does onyx come in different colors Yes, contrary to the popular belief, onyx comes in a variety of different colors. Jay Ellis Ransom,1974, Gems and Minerals of America Onyx stone colors conclusion: Besides its most popular color, black, onyx is also available in brown, white, blue, gray, orange, red and many more hues. Geological Survey, 2005, Mineral Resources Data System: U.S. ⓘ Grand Lake Mining District (Wolverine Mining District).Careless use of these names has resulted in the term 'Onyx' being incorrectly applied to a variety of banded materials that are not covered by the original definition of the name. Other names have been used over time for this material, such as " Mexican Onyx" and " onyx-marble". Onyx is a variety of chalcedony and green onyx is the trade name for chalcedony which has been dyed a deep green colour. This is a carbonate material and not true onyx. In recent times the name has become confused with other banded materials, in particular banded calcite formed in cave systems such as the material found in Mexico and Pakistan and often carved, in fact the majority of carved material (such as book-ends, chess-sets, etc.) that are available today are made from this carbonate rock. The traditional method to make onyx is reported to have involved soaking the stone for months in honey or some sugar-rich solution, and then into concentrated sulphuric acid, which turned the sugar-infused bands black. In correct usage, the name refers to a (usually) black and white banded variety of agate, or sometimes a monochromatic agate with dark and light parallel bands (brown and white for example) - but traditionally the name was reserved for black and white banded agate, and brown varieties named Sardonyx.
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