mineral

Quartz Geode

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Clear to white; Luster: Vitreous/glassy; Crystal structure: Trigonal/Hexagonal; Cleavage: None; Specific Gravity: 2.65

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

Identified May 25, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Clear to white; Luster: Vitreous/glassy; Crystal structure: Trigonal/Hexagonal; Cleavage: None; Specific Gravity: 2.65

Formation & geological history

Formed in cavities within sedimentary or volcanic rocks. Mineral-rich hydrothermal fluids seep into hollow spaces and crystallize over thousands to millions of years.

Uses & applications

Primarily used for decorative purposes, collecting, and in spiritual/metaphysical practices. High-purity quartz is also used in electronics and glass manufacturing.

Geological facts

The word 'geode' comes from the Greek word 'geoides' meaning earth-like. No two geodes are exactly alike internally, making each one unique to collectors.

Field identification & locations

Identify by its rounded exterior and hollow, crystal-filled interior. Often found in desert regions or limestone beds. Collectors look for unbroken nodules that feel lighter than expected for their size.