sedimentary
Sandstone Pebble
Arenite (primarily SiO2)
Hardness: 6-7 (Mohs); Color: Grayish-tan/greenish hue; Luster: Dull/Earthy; Crystal structure: Granular clastic; Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs)
- Color
- Grayish-tan/greenish hue
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Grayish-tan/greenish hue; Luster: Dull/Earthy; Crystal structure: Granular clastic; Cleavage: None; Specific gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. This specimen shows significant water-rounding, suggesting a fluvial or coastal history.
Uses & applications
Common river stones are used in landscaping, as aggregate in construction, or for decorative garden features.
Geological facts
Sandstone is one of the most common sedimentary rocks on Earth and can preserve ripple marks and fossils from the time the sand was deposited.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible grains. Often found in riverbeds, beaches, and sedimentary basins worldwide.
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