How is Onyx created?
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Updated: 2019/10/17
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Views: 551 Likes: 109
Reference Answer
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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