sedimentary
Sandstone
Arenite
Hardness: 6-7 on Mohs scale; Color: Tan, brown, yellow, and grey; Luster: Dull to earthy; Crystal structure: Clastic (grains); Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 on Mohs scale
- Color
- Tan, brown, yellow, and grey
- Luster
- Dull to earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Tan, brown, yellow, and grey; Luster: Dull to earthy; Crystal structure: Clastic (grains); Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed from cemented sand-sized grains of mineral, rock, or organic material. The grains are typically quartz or feldspar. Geological age varies widely from Precambrian to Holocene.
Uses & applications
Widely used in construction for building stone, paving, and crushing into sand for concrete. Also used for grindstones and in glass manufacturing.
Geological facts
Sandstone is one of the most common types of sedimentary rock and is often found in desert environments or ancient river beds. It is responsible for many of the world's most spectacular canyons.
Field identification & locations
Identify by its gritty, sand-like feel and visible grains. Common in arid regions and near coastlines. Collectors look for unique banding or fossil inclusions.
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Sandstone or Siltstone
Arenite (if sandstone)
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Brown Sandstone (River Rock)
Arenite
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Mudstone
Argillite / Siliciclastic sedimentary rock
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Cone-in-cone structure (Limestone)
Cone-in-cone structure (Secondary Sedimentary Structure)
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Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
sedimentary