sedimentary
Quartz Pebble / River Silt Grain
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale. Color: Tan, brownish-yellow, semi-translucent. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (microcrystalline). Specific Gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Tan, brownish-yellow, semi-translucent
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale. Color: Tan, brownish-yellow, semi-translucent. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (microcrystalline). Specific Gravity: 2.65.
Formation & geological history
Formed through mechanical weathering and erosion of larger quartz-bearing rocks (like granite or sandstone), rounded by water action in river, stream, or beach environments over thousands to millions of years.
Uses & applications
Commonly used in construction aggregate, landscaping, water filtration, or as general gravel sand.
Geological facts
Quartz is one of the most abundant minerals in Earth's continental crust. Rounded quartz pebbles are primary components of sedimentary rocks like conglomerate.
Field identification & locations
Identified by its hardness (scratches glass), lack of cleavage, and smooth, water-worn exterior. Found worldwide in sedimentary deposits, riverbeds, and beaches.
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