Onyx is a form or silicon dioxide (SiO2), and it is a "flavor" of quartz. It has a Mohs scale hardness of 7, and it is naturally brittle, like other forms of quartz. The hardness contributes to its strength, but it is at the same time a source of its weakness as brittle materials are subject to breakage. It can be worked and will take a high polish because it is quite hard. A link can be found below.
Onyx is not rare. In Mexico there is a town built mostly of onyx. A gram...perhaps a cent or less. The value of onyx is what is made from it.
The value of onyx is low compared to many precious stones. A small onyx stone might only be worth 20 dollars. The value varies greatly depending on the cut, size, and coloring of the stone.
According to GemPundit, black onyx costs $100 per carat.
Alot
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Onyx is not flammable.
Green onyx may be natural.
Onyx's streak is white.
Onyx is silicon dioxide with some impurities.
Onyx doesn't evolve by level you trade it holding a steal coat!!!!! ONYX ONYX ONYX
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Onyx is not flammable.
True Onyx is black.
The Onyx was created in 1966.
The Onyx ended in 1971.
No, Narda Onyx is not single.
Green onyx may be natural.
Genie Onyx is 147 cm.
Diamond is harder than onyx.
Gonatus onyx was created in 1972.
Onyx Pharmaceuticals was created in 1992.