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Onyx

Geologic: Onyx exhibits parallel banding making it very unique in composition, as most banding is very chaotic as seen in Agate. Black onyx is uniformly black chalcedony (microcrystalline quartz). 

Chemical composition: SiO2; Hardness: 6.5-7

Metaphysical: As a healing stone, Onyx can be used to banish grief, enhance self control, stimulate wise decision making, and encourage happiness and good fortune.

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