mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale; Color: colorless to white (milky) crystals; Luster: Vitreous (glassy); Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- colorless to white (milky) crystals
- Luster
- Vitreous (glassy)
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Physical properties
Hardness: 7 on Mohs scale; Color: colorless to white (milky) crystals; Luster: Vitreous (glassy); Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Formed as secondary mineral precipitates in hollow cavities (vugs) within igneous or sedimentary rocks. Hydrothermal fluids rich in silica deposit layers of crystals over thousands of years.
Uses & applications
Used in gemstone and jewelry production, crystal healing, collection, and industrial electronics as a piezoelectric material.
Geological facts
Geodes appear as ordinary mud-covered rocks from the outside, but contain beautiful crystalline voids inside. The word geode comes from the Greek word Geoides, which means earth-like.
Field identification & locations
Identify by the rough, brownish exterior rind contrasting with the white, sparkling internal crystalline structure. Common in desert regions such as Utah or volcanic regions like Brazil.
