mineral
Blue Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs scale); Color: Pale blue to bluish-grey with waxy luster; Crystal Structure: Trigonal (microscopic); Cleavage: None; Specific Gravity: 2.6
- Hardness
- 6
- Color
- Pale blue to bluish-grey with waxy luster
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Pale blue to bluish-grey with waxy luster; Crystal Structure: Trigonal (microscopic); Cleavage: None; Specific Gravity: 2.6
Formation & geological history
Formed via the deposition of silica from groundwater in cavities of volcanic rocks or sedimentary formations over millions of years, often in low-temperature hydrothermal environments.
Uses & applications
Primarily used as a gemstone in jewelry (cabochons, beads), decorative carvings, and as a collector's specimen. Known as a 'nurturing stone' in metaphysical circles.
Geological facts
The name 'chalcedony' comes from the ancient Greek town of Chalkedon. It is a fibrous variety of quartz where the crystals are too small to be seen without high magnification.
Field identification & locations
Identify by its waxy luster, conchoidal fracture, and lack of visible crystalline structure. Common in Turkey, Namibia, and the USA.
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