mineral
White Chalcedony
Silicon Dioxide (SiO2)
Hardness: 6.5-7 on the Mohs scale, Color: White with brownish inclusions, Luster: Waxy to vitreous, Crystal structure: Trigonal (microcrystalline quartz), Cleavage: None (conchoidal fracture), Specific gravity: 2.58-2.62
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 on the Mohs scale, Color: White with brownish inclusions, Luster: Waxy to vitreous, Crystal structure: Trigonal (microcrystalline quartz), Cleavage: None (conchoidal fracture), Specific gravity: 2.58-2.62
Formation & geological history
Formed in low-temperature hydrothermal environments and within cavities of volcanic rocks through the deposition of silica-rich waters.
Uses & applications
Used in ornamental carvings, jewelry, lapidary art, and crystal healing collections.
Geological facts
Chalcedony has been used since ancient times for making intaglios and seals because it holds fine details and is durable.
Field identification & locations
Identified by its waxy luster, conchoidal fracture, and lack of visible crystal faces. Commonly found worldwide in geodes and nodular masses.
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