sedimentary
Sandstone Pebble
Arenite (SiO2 based)
Hardness: 6-7 on Mohs scale; Color: Tan, brown, or grey; Luster: Dull/Earthy; Crystal Structure: Clastic texture; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 on Mohs scale
- Color
- Tan, brown, or grey
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Tan, brown, or grey; Luster: Dull/Earthy; Crystal Structure: Clastic texture; 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 calcium carbonate in riverbeds or coastal environments.
Uses & applications
Primarily used in construction, road base, and as a landscaping material. In larger forms, it is a significant building stone.
Geological facts
Sandstone is one of the most common sedimentary rocks on Earth and often acts as a natural aquifer, storing groundwater or petroleum within its porous structure.
Field identification & locations
Identify in the field by its gritty, sandpaper-like feel and visible grains. Commonly found in riverbeds, deserts, and coastal areas worldwide.
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Sandstone or Siltstone
Arenite (if sandstone)
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Mudstone
Argillite / Siliciclastic sedimentary rock
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Brown Sandstone (River Rock)
Arenite
sedimentary
Cone-in-cone structure (Limestone)
Cone-in-cone structure (Secondary Sedimentary Structure)
sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary