mineral
Chalcedony Geode / Quartz Druzy
Silicon Dioxide (SiO2)
Hardness: 6.5 to 7 on Mohs scale. Color: translucent grayish-white, light purple, to brownish tan. Luster: vitreous to waxy. Crystal structure: trigonal/microcrystalline. Cleavage: none, conchoidal fracture. Specific gravity: approx. 2.65.
- Hardness
- 6
- Color
- translucent grayish-white, light purple, to brownish tan
- Luster
- vitreous to waxy
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Physical properties
Hardness: 6.5 to 7 on Mohs scale. Color: translucent grayish-white, light purple, to brownish tan. Luster: vitreous to waxy. Crystal structure: trigonal/microcrystalline. Cleavage: none, conchoidal fracture. Specific gravity: approx. 2.65.
Formation & geological history
Forms when silica-rich hydrothermal fluids precipitate in cavities (geodes or vugs) within volcanic rock or sedimentary formations over long geological periods.
Uses & applications
Used primarily for ornamental displays, lapidary projects, mineral collection specimens, and metaphysical uses.
Geological facts
Botryoidal chalcedony and druzy quartz often line the interior of geodes together, creating sparkling, cauliflower-like or bubbly textures on the inner surfaces.
Field identification & locations
Identified by its sparkling druzy surface atop a smooth, waxy chalcedony base and hollow geode shape. Commonly found in basaltic lava flows and limestone deposits worldwide, including Brazil, Uruguay, and the USA.
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