mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
Hardness: 6.5-7 on Mohs scale; Color: Pale blue, lavender-blue, or grey-blue; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.6
- Hardness
- 6
- Color
- Pale blue, lavender-blue, or grey-blue
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Pale blue, lavender-blue, or grey-blue; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.6
Formation & geological history
Formed through the deposition of silica-rich water in volcanic and sedimentary cavities or fissures at relatively low temperatures.
Uses & applications
Commonly used in jewelry as cabochons, carvings, and ornamental objects; also popular as decorative towers or 'points' for collectors.
Geological facts
Blue Chalcedony is a cryptocrystalline variety of quartz. It often displays a phenomenon called the Tyndall effect, which gives it its luminous blue color by scattering light.
Field identification & locations
Identify by its waxy luster, translucency, and lack of visible crystals. It is frequently found in Namibia, Malawi, Turkey, and Brazil.
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Mineral/Rock
Banded Gneiss (River Rock/Pebble)
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Biotite Schist
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