How is Onyx created?

Category: Question and Answer Updated: 2019/10/17

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Onyx is formed of bands of chalcedony in alternating colors. It is cryptocrystalline, consisting of fine intergrowths of the silica minerals quartz and moganite. ... Artificial treatments have been used since ancient times to produce both the black color in 'black onyx' and the reds and yellows in sardonyx.

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