sedimentary
Pebble Gravel Mix (Quartzite, Basalt, Chert)
Alluvial River Gravel / Aggregate Clasts
Hardness: 6-7 on Mohs scale. Colors: grey, tan, brown, black, white quartz. Luster: dull to vitreous when wet. Texture: sub-rounded to rounded water-worn pebbles.
- Hardness
- 6-7 on Mohs scale
- Luster
- dull to vitreous when wet
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Physical properties
Hardness: 6-7 on Mohs scale. Colors: grey, tan, brown, black, white quartz. Luster: dull to vitreous when wet. Texture: sub-rounded to rounded water-worn pebbles.
Formation & geological history
Formed through mechanical weathering and erosion of pre-existing igneous, metamorphic, and sedimentary rocks, transported and rounded by water in rivers or streams.
Uses & applications
Construction aggregate, concrete mix, decorative landscaping, driveway surfacing, and pathway material.
Geological facts
River gravel collections often contain dozens of different rock types in a single handfull, representing a wide geological cross-section of the upstream region.
Field identification & locations
Look for rounded, smooth edges indicating water transport. Commonly found along riverbeds, beaches, and in construction aggregate piles. Very low monetary value as individual pebbles.
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