mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Tan to milky white with iron staining; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None (conchoidal fracture); SG: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Tan to milky white with iron staining
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Tan to milky white with iron staining; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None (conchoidal fracture); SG: 2.65
Formation & geological history
Formed from hydrothermal veins or as a primary constituent of igneous rocks. This specimen is water-worn or weathered, likely found in a riverbed or garden aggregate.
Uses & applications
Used in glass manufacturing, construction as a base material, landscaping, and as a common source for crushed stone.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. It is chemically very stable, which is why it often remains as pebbles after other minerals have weathered away.
Field identification & locations
Identify by its hardness (it will scratch glass) and lack of cleavage. Commonly found in gravel pits, riverbeds, and beaches worldwide.
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Schist
Schist
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Potassium Feldspar (Orthoclase)
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Mineral
Epidote
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