sedimentary
Sandstone Pebble / Quartzite Pebble
SiO2 (Silicon Dioxide enriched sedimentary rock)
Hardness: 6-7 on Mohs scale; Color: Reddish-brown to tan; Luster: Dull to earthy; Texture: Fine-grained, abrasive feel, well-rounded triangular shape from water erosion; Specific Gravity: approx. 2.65
- Hardness
- 6-7 on Mohs scale
- Color
- Reddish-brown to tan
- Luster
- Dull to earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Reddish-brown to tan; Luster: Dull to earthy; Texture: Fine-grained, abrasive feel, well-rounded triangular shape from water erosion; Specific Gravity: approx. 2.65
Formation & geological history
Formed through the accumulation, compaction, and cementation of sand-sized mineral grains or rock fragments (predominantly quartz and feldspar), followed by erosion and rounded smoothing in a stream, river, or coastal beach environment.
Uses & applications
Commonly used as construction aggregate, landscaping gravel, or river rock decor. Smooth pebbles are also gathered for rock tumbling and decorative crafts.
Geological facts
River pebbles like this specimen often undergo hundreds or thousands of years of natural water transport, which grinds away sharp edges to produce smooth, sub-triangular or oval shapes.
Field identification & locations
Identified by its sandy, grainy texture, uniform brownish coloration, and smooth, water-worn edges. Very common in riverbeds, glacial tills, and coastal deposits globally.
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