mineral
Chalcedony (Tumbled)
Cryptocrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs), Color: Translucent grey to pale yellow, Luster: Waxy to vitreous, Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.58-2.64
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs), Color: Translucent grey to pale yellow, Luster: Waxy to vitreous, Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.58-2.64
Formation & geological history
Formed by the deposition of silica from aqueous solutions at low temperatures in cavities and fractures of various rocks, particularly volcanic and sedimentary environments.
Uses & applications
Used extensively in jewelry as gemstones, cabochons, and beads; also used for decorative carvings and as a collector specimen.
Geological facts
Chalcedony is not a single mineral but a term for various varieties of microcrystalline quartz. It was historically used to make tools and weapons due to its hardness and conchoidal fracture.
Field identification & locations
Identify by its waxy luster, lack of visible crystals, and translucency. Commonly found in Brazil, India, and the United States (western states). It is a durable stone suitable for all types of jewelry.
