mineral

Quartz Geode (Water-worn)

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 (Mohs scale); Color: White to translucent; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture.

Hardness: 7 (Mohs scale)
Color: White to translucent
Luster: Vitreous to waxy

Identified May 4, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White to translucent; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture.

Formation & geological history

Formed in cavities (vugs) within volcanic or sedimentary rocks where silica-rich groundwater precipitates over long geological periods. This specimen has been rounded by fluvial or coastal transport.

Uses & applications

Commonly used for collecting, decorative purposes, and sometimes crushed for industrial silica glass production.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. This piece shows internal crystallization that has been exposed and smoothed by water erosion.

Field identification & locations

Identify by its hardness (will scratch glass), lack of reaction to acid, and crystalline structure within the cavities. Found globally in riverbeds and coastal regions.