sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale. Color: White, gray, yellowish brown due to weathering. Luster: Vitreous to dull. Crystal structure: Trigonal. Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- White, gray, yellowish brown due to weathering
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale. Color: White, gray, yellowish brown due to weathering. Luster: Vitreous to dull. Crystal structure: Trigonal. Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.65.
Formation & geological history
Formed through the mechanical weathering and erosion of quartz-bearing parent rocks such as granite or quartzite, followed by water transport and rounding in riverbeds or marine environments.
Uses & applications
Used in landscaping, decorative gravel, aggregate in construction, and as a raw material for silicon and glass production.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, making it extremely resistant to chemical weathering, which is why it often survives as rounded pebbles in streams and beaches.
Field identification & locations
Can be identified in the field by its high hardness (scratches glass), lack of cleavage, and resistance to acid. Commonly found in riverbeds, glacial tills, and sedimentary conglomerates worldwide.
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