mineral

Quartz Geode / Druzy Quartz

Silicon Dioxide (SiO2)

Mohs hardness 7, vitreous to dull luster, hexagonal crystal system (microcrystalline to coarse crystals), pale yellowish-brown to beige color, non-cleavable with conchoidal fracture.

Identified July 26, 2026More mineral →

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Physical properties

Mohs hardness 7, vitreous to dull luster, hexagonal crystal system (microcrystalline to coarse crystals), pale yellowish-brown to beige color, non-cleavable with conchoidal fracture.

Formation & geological history

Formed via hydrothermal precipitation or mineral-rich groundwater filling cavities in volcanic or sedimentary host rocks, crystallizing over millions of years.

Uses & applications

Used primarily for lapidary arts, decorative home displays, educational collections, and metaphysical crystal practices.

Geological facts

Geodes often look like ordinary, rough stones from the outside, but cracking them open reveals sparkling crystalline interiors. Iowa chose the geode as its state rock in 1967.

Field identification & locations

Identified by its bumpy, nodular exterior and sparkling crystalline surface texture. Commonly found in stream beds, limestone quarries, and desert environments worldwide.