mineral

Quartz Geode Fragment

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 (Mohs scale); Color: White to translucent with yellowish iron staining; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Hardness: 7 (Mohs scale)
Color: White to translucent with yellowish iron staining
Luster: Vitreous to waxy

Identified July 9, 2026More mineral →

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Physical properties

Formation & geological history

Formed as secondary minerals in hollow cavities within volcanic or sedimentary rocks. Silica-rich water precipitates crystals over long geological periods.

Uses & applications

Primarily used for geological education, lapidary practice, decorative collections, and metaphysical purposes.

Geological facts

The word geode is derived from the Greek word 'Geoides' meaning earth-like. They often look like ordinary rocks on the outside but contain hollow crystalline interiors.

Field identification & locations

Identify by looking for a vug or cavity lined with crystals. Common in riverbeds and limestone regions. A streak test will produce no color, and the specimen will scratch glass easily.