sedimentary
Sandstone (Calcareous/Lithic)
Sedimentary Rock (Clastic Sandstone with Calcium Carbonate cement)
Hardness: 6-7 (individual quartz grains), 3-4 (cement); Color: Tan, beige, grey; Luster: Dull/Earthy; Structure: Clastic, granular; Cleavage: None
- Hardness
- 6-7 (individual quartz grains), 3-4 (cement)
- Color
- Tan, beige, grey
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (individual quartz grains), 3-4 (cement); Color: Tan, beige, grey; Luster: Dull/Earthy; Structure: Clastic, granular; Cleavage: None
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments (clasts) at the Earth's surface and within bodies of water over millions of years.
Uses & applications
Commonly used as a building material, road base, or aggregate. Historically significant for sculptural use and grindstones.
Geological facts
Sandstone preserves a history of the Earth's surface conditions, including prehistoric river beds and ancient desert dunes. It often contains fossils.
Field identification & locations
Identify by its gritty, sandpaper-like feel and visible grains. Test with diluted acid (like vinegar); if it fizzes, it contains calcite cement. Found in almost any sedimentary basin.
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