Onyx is made up of a variety of cryptocrystalline quartz, and is made up of bands, which are parallel and regular. Its appearance is most striking when the bands are of sharply contrasting colors. 

It is often considered a gemstone. It is one of the most striking and beautiful stones, but is fragile. It is popular for jewelry, vases, and figurines. It can be used for fireplace surrounds, table tops, bar tops, etc., but may scratch easily.

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