sedimentary
Sandstone
Arenite (SiO2 based clastic rock)
Hardness: 6-7 Mohs; Color: Tan, beige, brown; Luster: Dull/Earthy; Structure: Clastic, granular texture; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 Mohs
- Color
- Tan, beige, brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan, beige, brown; Luster: Dull/Earthy; Structure: Clastic, granular texture; Specific Gravity: 2.2-2.8
Formation & geological history
Formed over millions of years through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in desert, river, or coastal environments.
Uses & applications
Commonly used as a building material, paving stone, and in the production of glass and industrial abrasives. In small specimens, it is primarily of educational or local interest.
Geological facts
Sandstone represents about 20% of all sedimentary rocks on Earth. The famous red rocks of the Grand Canyon and Petra in Jordan are made primarily of sandstone.
Field identification & locations
Identified by its sandy feel (like sandpaper) and visible grains. Found worldwide in sedimentary basins. Collectors often look for colorful banding or fossil inclusions.
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Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Brown Sandstone (River Rock)
Arenite
sedimentary
Mudstone
Argillite / Siliciclastic sedimentary rock
sedimentary
Cone-in-cone structure (Limestone)
Cone-in-cone structure (Secondary Sedimentary Structure)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
sedimentary