mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale. Color: Clear to white. Luster: Vitreous (glassy). Crystal Structure: Hexagonal/Trigonal (druzy). Specific Gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Clear to white
- Luster
- Vitreous (glassy)
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Physical properties
Hardness: 7 on Mohs scale. Color: Clear to white. Luster: Vitreous (glassy). Crystal Structure: Hexagonal/Trigonal (druzy). Specific Gravity: 2.65.
Formation & geological history
Formed as mineral-rich water precipitates inside cavities of volcanic or sedimentary rocks. Over thousands of years, crystals grow inward from the outer shell.
Uses & applications
Commonly used for home decor, educational specimens, metaphysical collecting, and occasionally as a source of high-purity silica for electronics.
Geological facts
Geodes are often called 'thunder eggs' when they are completely filled with minerals. This specific piece shows a druzy quartz coating on a chalcedony or host-rock base.
Field identification & locations
Identify in the field by looking for rounded, hollow-sounding nodules that look like ordinary stones on the outside. Common in Brazil, Mexico, and the USA (Iowa, Oregon).
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