sedimentary
Sandstone
Arenite
AI-generated identification · may be incorrectTexture: Clastic, fine to medium-grained; Hardness: 6-7 Mohs (variable based on cement); Color: Tan, yellow, reddish-brown (influenced by iron oxide); Luster: Dull or earthy; Structure: Bedded or massive; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 Mohs (variable based on cement)
- Color
- Tan, yellow, reddish-brown (influenced by iron oxide)
- Luster
- Dull or earthy
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Physical properties
Texture: Clastic, fine to medium-grained; Hardness: 6-7 Mohs (variable based on cement); Color: Tan, yellow, reddish-brown (influenced by iron oxide); Luster: Dull or earthy; Structure: Bedded or massive; Specific Gravity: 2.2-2.8
Formation & geological history
Formed via the accumulation of sand-sized mineral particles or rock fragments, principally quartz and feldspar, through erosion and deposition in marine, river, or desert environments, followed by lithification and cementation.
Uses & applications
Extensively used as a building material, paving material, and decorative stone in construction; also used for glass manufacturing in its high-purity silica form and as a reservoir rock for oil and natural gas.
Geological facts
Sandstone represents about 20-25% of all sedimentary rocks on Earth. Its porosity makes it a critical aquifer for storing groundwater and a primary trap for hydrocarbons.
Field identification & locations
Identify in the field by its gritty, sandpaper-like feel and visible grains; often shows layering (bedding). Found commonly in canyons, plateaus, and coastal cliffs worldwide. Collectors value specimens with unique cross-bedding or fossil inclusions.
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
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Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary