mineral
Blue Chalcedony (likely dyed Agate)
Silicon Dioxide (SiO₂)
AI-generated identification · may be incorrectHardness: 6.5–7 (Mohs scale), Color: Inky blue to teal (likely enhanced), Luster: Waxy to vitreous, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.60–2.64
- Hardness
- 6
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Physical properties
Hardness: 6.5–7 (Mohs scale), Color: Inky blue to teal (likely enhanced), Luster: Waxy to vitreous, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.60–2.64
Formation & geological history
Formed in volcanic and sedimentary environments through the deposition of silica from groundwater in rock cavities or veins. Common in geodes and volcanic bubbles.
Uses & applications
Used primarily in lapidary work for cabochons, beads, and tumbled stones. Also popular in jewelry and metaphysical collections.
Geological facts
Many intensely blue tumbled stones sold in shops are natural Brazilian agates that have been dyed to achieve a deep, uniform blue color, as natural blue chalcedony is typically paler and more translucent.
Field identification & locations
Identify by its waxy luster, conchoidal fracture (visible in chips), and its ability to scratch glass but not quartz. Commonly found in Brazil, India, and Madagascar.
