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CHALCEDONY, a form of quartz encompassing all cryptocrystalline varieties
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VARIETY INFORMATION:
- VARIETY OF: Crypto-crystalline
Quartz
, SiO2
- USES: Gemstone and ornamental stone.
- COLOR: black and/or white
- HARDNESS: 7
- CLEAVAGE: none
- CRYSTAL SYSTEM: none visible (actual crystals are microscopic)
- For natural Chalcedony mineral specimens see our For Sale or Sold lists
Chalcedony is
the generic name for "cryptocrystalline quartz", meaning the individual
crystals are too small to see.
The primary varieties of chalcedony are as follows:
- Agate is a banded variety
(sometimes with translucent bands)
- Bloodstone is
green with red speckles
- Carnelian is yellow
to orange
- Chrysoprase is
green
- Flint is generally black
with a fibrous microscopic structure
- Jasper is any colorful
agate
- Onyx is black, white, or
alternating black and white
- Sard is yellow to brown
- Sardonyx is banded,
alternating sard and (usually white) onyx
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