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About the Stone
Onyx is very fine-grained chalcedony, completely opaque and able to take a deep glassy polish, which is what makes a plain dome work at this size. Uniformly black chalcedony is rare in nature, so material of this even tone is darkened by a long-established carbon treatment. The polished surface shows fingerprints readily.
- Family
Chalcedony (microcrystalline quartz)
- Hardness
6.5 - 7
- Note
Onyx is banded chalcedony - the same layered silica structure as agate, but with the bands lying in flat parallel planes rather than concentric rings. Uniformly black material is uncommon in nature, so most black onyx on the market is pale chalcedony darkened by a long-established sugar-and-acid treatment that deposits carbon in its pores.
Product Details
- Stone type
Black onyx, colour-treated chalcedony
- Finish
Domed cabochons, high polish, 6 mm
- Availability
Handmade, ready to ship
- Care
Wipe with a soft dry cloth. Avoid solvents, bleach and abrasive polishes.
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