mineral

Quartz Geode

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: White, clear, or off-white; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Hardness: 7 (Mohs scale)
Color: White, clear, or off-white
Luster: Vitreous to waxy

Identified July 6, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White, clear, or off-white; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Formation & geological history

Formed in cavities within sedimentary or volcanic rocks. Mineral-rich groundwater precipitates quartz crystals over thousands of years inside a hollow space.

Uses & applications

Mainly used for decoration, educational purposes, and by mineral collectors. Large-scale quartz is used in the glass and electronics industries.

Geological facts

The word 'geode' comes from the Greek word 'Geoides' meaning 'earth-like'. No two geodes are exactly alike on the inside.

Field identification & locations

Identify by a lumpy, rounded exterior that feels lighter than a solid rock of the same size. Commonly found in desert regions or limestone beds. Shaking a geode can sometimes reveal a hollow core if pieces are loose.