sedimentary
Sandstone
Arenite (SiO2 primarily)
Mohs hardness: 6-7; Color: tan, yellow, or brown; Luster: dull/earthy; Texture: clastic/gritty; Specific gravity: 2.2-2.8.
- Hardness
- 6-7
- Color
- tan, yellow, or brown
- Luster
- dull/earthy
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Physical properties
Mohs hardness: 6-7; Color: tan, yellow, or brown; Luster: dull/earthy; Texture: clastic/gritty; Specific gravity: 2.2-2.8.
Formation & geological history
Formed by the accumulation and cementation of sand-sized grains, typically quartz or feldspar, in environments such as beaches, deserts, or river beds.
Uses & applications
Used extensively as a building material, in glass manufacturing, for paving, and as an abrasive.
Geological facts
Sandstone is highly porous and acts as a major reservoir for groundwater and petroleum; it often contains beautiful cross-bedding structures.
Field identification & locations
Identified by its gritty feel (like sandpaper) and visible sand grains. Found globally in canyon walls and outcrops. Look for layered structures.
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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