mineral

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in Geode form

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: Clear to white; Luster: Vitreous/glassy; Crystal Structure: Hexagonal (Trigonal); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Clear to white
Luster: Vitreous/glassy

Identified July 11, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Clear to white; Luster: Vitreous/glassy; Crystal Structure: Hexagonal (Trigonal); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Formed within hollow cavities in sedimentary or igneous rock. Mineral-rich groundwater precipitates quartz crystals over thousands of years inside these bubbles or gas pockets. Typically Cretaceous or younger in age.

Uses & applications

Decorative display, metaphysical collecting, educational geological specimens, and jewelry components.

Geological facts

Geodes are essentially 'rock bubbles'. While they look like ordinary lumpy rocks on the outside, they contain hollow cavities lined with crystals on the inside. Most commercial quartz geodes like this one come from Morocco.

Field identification & locations

Identified by a round or egg-shaped exterior with a bumpy surface and a weight that is lighter than it looks (due to the hollow center). Found in desert regions or limestone quarries. Use a rock hammer to carefully crack open suspected specimens.