sedimentary
Sandstone
Arenite (SiO2 based)
AI-generated identification · may be incorrectHardness: 6-7 (if quartz-based); Color: Tan, brown, or reddish; Luster: Dull or earthy; Texture: Gritty like sandpaper; Structure: Clastic
- Hardness
- 6-7 (if quartz-based)
- Color
- Tan, brown, or reddish
- Luster
- Dull or earthy
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Physical properties
Hardness: 6-7 (if quartz-based); Color: Tan, brown, or reddish; Luster: Dull or earthy; Texture: Gritty like sandpaper; Structure: Clastic
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years, typically in river beds, beaches, or deserts.
Uses & applications
Commonly used as a building material, in paving, for glass manufacture (if high silica), and as a reservoir rock for oil and gas.
Geological facts
Sandstone makes up about 20 to 25 percent of all sedimentary rocks on Earth and often preserves fossils or ancient ripple marks from water currents.
Field identification & locations
Identify by its distinct sandy feel when rubbed; it is found globally in sedimentary basins. Collectors often look for colorful banding 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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Sandstone
Arenite
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary