mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectMohs hardness of 6.5 to 7, pale blue to lavender color, waxy to vitreous luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.64
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Physical properties
Mohs hardness of 6.5 to 7, pale blue to lavender color, waxy to vitreous luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.64
Formation & geological history
Formed in low-temperature hydrothermal environments, cavities, and veins within volcanic and sedimentary rocks where silica-rich fluids deposit microcrystalline quartz over geological time scales
Uses & applications
Used in ornamental carvings, gemstone jewelry, lapidary arts, and as a collector specimen
Geological facts
Chalcedony has been used since antiquity to create intaglios, seals, and beads; the blue variety is particularly valued for its calming pastel hue
Field identification & locations
Identified by its waxy luster, conchoidal fracture, and smooth blue coloration without distinct visible crystals; commonly found in deposits worldwide including the USA, Brazil, India, and Madagascar
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