Chalcedony
Chalcedony is a gemstone composed of aggregates of microscopic quartz crystals, characterized by its soft, milky texture. Available in a variety of colors and patterns, it has been used for ornamentation and carving since ancient times.
Bluish-white Chalcedony
Basic Information
| Chemical Formula | SiO₂ |
|---|---|
| Classification | Cryptocrystalline (Hexagonal system) |
| Hardness | 7 (Mohs scale) |
| Specific Gravity | Approx. 2.61 |
| Crystal Structure | Aggregate of microcrystalline quartz |
Features
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Banding: Striped structures are created during cooling, forming patterns seen in agate and onyx.
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Coloration: Characterized by natural colors such as red, orange, and green due to iron or nickel.
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Color Variations: Red Orange Green
Varieties & Aliases
- Variety Carnelian: A red-toned variety colored by iron.
- Variety Chrysoprase: Colored green by nickel.
- Variety Chatoyancy: Varieties exhibiting luster due to orderly internal structures.
Note: Since artificial treatments such as heating and dyeing are sometimes performed, it is important to check before purchasing.