mineral

Quartz Geode

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: White, clear, or brownish-red due to iron oxide staining; Luster: Vitreous to dull; Crystal structure: Trigonal; Cleavage: None; Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: White, clear, or brownish-red due to iron oxide staining
Luster: Vitreous to dull

Identified August 3, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: White, clear, or brownish-red due to iron oxide staining; Luster: Vitreous to dull; Crystal structure: Trigonal; Cleavage: None; Specific gravity: 2.65

Formation & geological history

Formed in hollow spaces in rocks, commonly in sedimentary or volcanic environments, through the slow deposition of silica-rich groundwater over millions of years.

Uses & applications

Used in mineral collecting, ornamental displays, jewelry making, and metaphysical practices.

Geological facts

Geodes form when mineral-rich groundwater seeps into a cavity in a host rock, slowly precipitating crystals inward from the outer wall over immense periods of geological time.

Field identification & locations

Easily identified by its spherical or nodular exterior with a hollow or crystal-filled interior lined with quartz or chalcedony. Found worldwide in volcanic and sedimentary rock formations.