mineral

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in Geode form

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 June 24, 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 in cavities within sedimentary or volcanic rock. Over millions of years, mineral-rich water seeps into hollow spaces (bubbles or burrows) and precipitates crystals slowly inward. Common in Cenozoic and Mesozoic formations.

Uses & applications

Primarily used for geological collecting, educational displays, gemstone healing/spiritual practices, and decorative home decor. Highly pure 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 inside, and most are found as unremarkable-looking round rocks until they are cracked open.

Field identification & locations

Identify in the field by looking for rounded, lumpy nodules that feel lighter than other rocks of the same size. Commonly found in desert regions of Morocco, Mexico, and the Midwestern United States (Indiana/Iowa).

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