gemstone
Blue Chalcedony
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs); Color: Pale blue to sky blue; Luster: Vitreous to waxy; Structure: Cryptocrystalline; Cleavage: None; SG: 2.6
- Hardness
- 6
- Color
- Pale blue to sky blue
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Pale blue to sky blue; Luster: Vitreous to waxy; Structure: Cryptocrystalline; Cleavage: None; SG: 2.6
Formation & geological history
Formed through the deposition of silica from aqueous solutions, often in cavities of volcanic rocks or sedimentary environments. It is a microcrystalline variety of quartz.
Uses & applications
Used primarily in jewelry as beads and cabochons, and in ornamental carvings or collector specimens.
Geological facts
Chalcedony was used by ancient civilizations for cylinder seals and amulets. The specific blue hue is often caused by the Tyndall effect, where light scatters off tiny particles within the stone.
Field identification & locations
Identify by its waxy luster, lack of visible crystals, and hardness. Found in locations like Namibia, Turkey, India, and the United States (western states). Look for a milky translucency.
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