mineral
Quartz Geode Fragment
Crystalline Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Tan to white; Luster: Vitreous to dull; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Tan to white
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Tan to white; Luster: Vitreous to dull; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
Formation & geological history
Formed in the cavities of sedimentary or volcanic rocks where mineral-rich water precipitates quartz crystals over millions of years. This specifically appears to be a druzy quartz cavity within a sedimentary chalcedony nodule.
Uses & applications
Colleting specimen, educational purposes, ornamental use, and metaphysical crystal collecting. Small fragments like this are often used in rock tumblers or kids' geology kits.
Geological facts
Geodes are like geological time capsules; the outside looks like a common rock, but the inside reveals a hollow cavity lined with crystals that may have taken thousands of years to grow.
Field identification & locations
Identify by the presence of a bubbly or crystal-lined cavity (vug) inside a rounded rock. Commonly found in riverbeds or limestone deposits in regions like the American Midwest (Keokuk geodes) or Morocco.
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