sedimentary
Sandstone (likely Arkosic)
Arenite (SiO2 based)
AI-generated identification · may be incorrectHardness: 6-7 (Mohs), Color: Brownish-red to tan, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs), Color: Brownish-red to tan, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Specific Gravity: 2.2-2.8
Formation & geological history
Formed by the accumulation of sand-sized mineral grains or rock fragments, cemented together by minerals like silica or iron oxide. Typically found in river beds, beaches, or desert environments.
Uses & applications
Used extensively in construction as dimension stone, paving, and architectural accents due to its durability and aesthetic appeal.
Geological facts
Sandstone records the history of ancient environments through cross-bedding and ripple marks. It is often a key reservoir for groundwater or oil.
Field identification & locations
Identified by its gritty feel like sandpaper and visible sand grains. Found globally in sedimentary basins. Collectors look for unique weathering patterns or fossils within the layers.
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Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
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Sedimentary Sandstone
Arenite (Sedimentary Rock)
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Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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