mineral

Quartz Geode

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: Colorless to white/opaque; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Colorless to white/opaque
Luster: Vitreous to greasy

Identified July 12, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Colorless to white/opaque; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Formed as secondary mineral precipitates in hollow cavities (vugs) within igneous or sedimentary rocks. Silica-rich hydrothermal fluids seep into the cavity, slowly crystallizing over thousands of years.

Uses & applications

Primarily used for decorative purposes, collectors' specimens, and metaphysical practices. High-purity quartz is used in electronics and glass-making.

Geological facts

The word geode comes from the Greek word 'Geoides' meaning earth-like. Unlike solid nodules, geodes are hollow, and this specimen represents a fragment of a larger druzy cavity.

Field identification & locations

Identify by its vuggy, crystalline interior contrasted against a rough, weathered outer rind. Often found in limestone or volcanic ash beds. Look for round or egg-shaped stones that feel lighter than they look.