mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on Mohs scale, pale blue to grey color, waxy to vitreous luster, microcrystalline quartz structure with no visible cleavage.
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Physical properties
Hardness of 7 on Mohs scale, pale blue to grey color, waxy to vitreous luster, microcrystalline quartz structure with no visible cleavage.
Formation & geological history
Forms in low-temperature hydrothermal veins and cavities within volcanic and sedimentary rocks.
Uses & applications
Widely used in ornamental carvings, polished crystal towers, and jewelry making.
Geological facts
Chalcedony has been used since antiquity to create intaglios and seals due to its toughness and fine grain.
Field identification & locations
Identified by its waxy luster and translucency; commonly sourced from deposits in India, Brazil, and the USA.
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