mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, light blue to lavender color, waxy to vitreous luster, and microcrystalline cryptocrystalline structure with no visible cleavage.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, light blue to lavender color, waxy to vitreous luster, and microcrystalline cryptocrystalline structure with no visible cleavage.
Formation & geological history
Forms in low-temperature hydrothermal environments and by deposition from silica-rich solutions in cavities of volcanic rocks.
Uses & applications
Widely used for making tumbled stones, beads, carved ornaments, and artisan jewelry.
Geological facts
Chalcedony has been used since ancient times for gemstone carvings, seals, and signet rings across Mediterranean civilizations.
Field identification & locations
Identified by its waxy luster, conchoidal fracture, and uniform pale blue color; commonly sourced from Turkey, Brazil, and the USA.
