mineral

Chalcedony Geode / Quartz Druzy

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

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

Identified July 23, 2026More mineral →

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Physical properties

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.