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About the Stone
Onyx is chalcedony, the same fine-grained silica as agate but with its bands lying in flat parallel planes. Naturally uniform black material is scarce, so beads of this colour are almost always pale chalcedony darkened by a long-established treatment, which is how the tone stays consistent across a strand. The surface takes a high polish and 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
- Bead size
8 mm rounds
- Approximate length
19 cm, elasticated
- Finish
High polish
- Availability
Handmade, ready to ship
- Care
Wipe with a soft dry cloth. Avoid solvents, bleach and abrasive polishes.
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