sedimentary
Sandstone Pebble
Arenite (SiO2 complex)
AI-generated identification · may be incorrectHardness: 6-7 Mohs; Color: Tan, beige, grey; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 Mohs
- Color
- Tan, beige, grey
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan, beige, grey; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed by the accumulation and lithification of sand-sized mineral grains or rock fragments, typically through pressure and mineral cements like silica or calcite. Common in riverbeds and coastal environments.
Uses & applications
Used in construction, glass manufacturing, and as decorative gravel. Small pebbles are often used in landscaping or as filler material.
Geological facts
Sandstone can preserve fossilized footprints and ripple marks from ancient riverbeds or beaches. It makes up about 20% of all sedimentary rocks on Earth.
Field identification & locations
Identify by its gritty texture and visible sand grains. Found globally in areas with past or present water flow. Common on beaches and river banks.
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Arenite (if sandstone)
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Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
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Sedimentary Sandstone
Arenite (Sedimentary Rock)
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Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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