How is Onyx created?
Category: Question and Answer
Updated: 2019/10/17
Views: 552
Likes: 109
Views: 552
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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