mineral
Blue Chalcedony
Chalcedony (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 on Mohs scale. Color: Pale blue, lavender-blue, or gray-blue. Luster: Vitreous to waxy. Crystal Structure: Trigonally based microcrystalline quartz. Specific Gravity: 2.58-2.64.
- Hardness
- 6
- Color
- Pale blue, lavender-blue, or gray-blue
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Pale blue, lavender-blue, or gray-blue. Luster: Vitreous to waxy. Crystal Structure: Trigonally based microcrystalline quartz. Specific Gravity: 2.58-2.64.
Formation & geological history
Formed at low temperatures through the deposition of silica from groundwater in cavities of other rocks, particularly volcanic rocks. These often occur as botryoidal masses or lining geodes.
Uses & applications
Primarily used in jewelry for cabochons, beads, and carvings. Also used as an ornamental stone and by collectors.
Geological facts
Blue chalcedony is known for its subtle, milky translucency. Historically, it was believed to promote harmony and calm. High-quality translucent blue material from Namibia and Turkey is highly sought after.
Field identification & locations
Identify in the field by its waxy luster, lack of cleavage, conchoidal fracture, and hardness. It is commonly found in Brazil, Namibia, Turkey, and India.
