mineral
Brown Chalcedony
Silicon Dioxide (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, brownish color, waxy to vitreous luster, cryptocrystalline crystal structure, conchoidal fracture with no true cleavage, and a specific gravity of 2.60 to 2.65.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, brownish color, waxy to vitreous luster, cryptocrystalline crystal structure, conchoidal fracture with no true cleavage, and a specific gravity of 2.60 to 2.65.
Formation & geological history
Formed in low-temperature environments through the deposition of silica-rich solutions in rock cavities, fractures, or sedimentary environments.
Uses & applications
Used for making jewelry, ornamental carvings, lapidary art, and cherished by mineral collectors.
Geological facts
Chalcedony has been used since antiquity to create intricate intaglios, seals, and beads due to its durability and smooth finish.
Field identification & locations
Can be identified in the field by its waxy luster, conchoidal fracture, and lack of visible crystal faces without magnification. Commonly found worldwide in volcanic and sedimentary rock cavities.
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