sedimentary
Quartz Pebble
Silicon Dioxide (SiO2) Pebble
AI-generated identification · may be incorrectHardness: 7 on Mohs scale. Color: Pale beige, tan, whitish grey. Luster: Dull to sub-vitreous. Crystal Structure: Trigonal (microcrystalline/cryptocrystalline aggregate). Cleavage: None (conchoidal fracture).
- Hardness
- 7 on Mohs scale
- Color
- Pale beige, tan, whitish grey
- Luster
- Dull to sub-vitreous
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Physical properties
Hardness: 7 on Mohs scale. Color: Pale beige, tan, whitish grey. Luster: Dull to sub-vitreous. Crystal Structure: Trigonal (microcrystalline/cryptocrystalline aggregate). Cleavage: None (conchoidal fracture).
Formation & geological history
Formed through mechanical weathering and stream or beach erosion of quartz-rich igneous, metamorphic, or sedimentary rocks, creating a well-rounded pebble over time.
Uses & applications
Commonly used as construction aggregate, landscaping gravel, river rock decor, and for stone tumbling.
Geological facts
Quartz pebbles are among the most resistant rocks to chemical and physical weathering, allowing them to survive long transport distances in rivers and oceans.
Field identification & locations
Identified by its rounded shape, hardness (scratches glass, cannot be scratched by steel knife), and resistance to acid. Found abundantly in riverbeds, lakeshores, and glacial deposits worldwide.
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