sedimentary
Sandstone
Arenite (SiO2 primarily)
Mohs hardness: 6-7; Color: Tan, beige, or yellow; Luster: Dull/Earthy; Crystal structure: Clastic (composed of sand-sized mineral grains); Cleavage: None, breaks with sub-conchoidal to uneven fracture; Specific Gravity: 2.2 to 2.8.
- Hardness
- 6-7
- Color
- Tan, beige, or yellow
- Luster
- Dull/Earthy
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Physical properties
Mohs hardness: 6-7; Color: Tan, beige, or yellow; Luster: Dull/Earthy; Crystal structure: Clastic (composed of sand-sized mineral grains); Cleavage: None, breaks with sub-conchoidal to uneven fracture; Specific Gravity: 2.2 to 2.8.
Formation & geological history
Formed over millions of years by the accumulation and lithification of sand grains, typically in deserts, riverbeds, or coastal environments. This specimen appears as a buried clast in sandy soil, indicating recent alluvial or glacial deposition.
Uses & applications
Extensively used as a building material, in the glass industry (if pure silica), as a reservoir rock for oil and gas, and as a decorative stone in landscaping.
Geological facts
Sandstone is highly porous and acts as a natural water filter in aquifers. It often preserves fossils and ripple marks from ancient environments.
Field identification & locations
Identify by its gritty, sand-paper like feel and visible grains. Found globally in basins and mountainous regions. For collectors, look for layers or fossils within the matrix.
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Sandstone
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