mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Yellowish-tan to milky white; Luster: Vitreous to waxy (when water-worn); Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture.
- Hardness
- 7 on Mohs scale
- Color
- Yellowish-tan to milky white
- Luster
- Vitreous to waxy (when water-worn)
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Physical properties
Hardness: 7 on Mohs scale; Color: Yellowish-tan to milky white; Luster: Vitreous to waxy (when water-worn); Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed through hydrothermal veins or as a primary constituent of igneous rocks, then weathered out and transported by water (rivers/streams) causing the rounded, polished shape.
Uses & applications
Industrial use in glassmaking, abrasives, and electronics. Small pebbles are often used in landscaping or as decorative aggregate.
Geological facts
Quartz is the most abundant and stable mineral on Earth's continental crust. These rounded specimens are often called 'river stones' or 'creek stones' and illustrate the process of mechanical weathering.
Field identification & locations
Identify in the field by its hardness (it will scratch glass) and lack of cleavage. Common in riverbeds, glacial tills, and beaches worldwide.
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