sedimentary
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
Hardness: 7 (Mohs scale); Color: White to off-white/beige; Luster: Vitreous to waxy; Structure: Hexagonal (trigonal) crystal system, though rounded by water; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Color
- White to off-white/beige
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: White to off-white/beige; Luster: Vitreous to waxy; Structure: Hexagonal (trigonal) crystal system, though rounded by water; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Formed as a mineral in hydrothermal veins or igneous rocks, then weathered out and transported by rivers or waves. The rounded shape indicates high-energy water erosion over a long period.
Uses & applications
Used in construction as aggregate, in landscaping, as a source for silicon in glass making, and as pocket stones or decorative items.
Geological facts
Quartz is one of the most abundant minerals in Earth's continental crust and is chemically stable enough to survive the mechanical weathering that destroys most other minerals.
Field identification & locations
Identify in the field by its hardness (it can scratch glass) and lack of cleavage. Commonly found in riverbeds, beaches, and gravel pits globally.
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