sedimentary
Sandstone (with potential Arkose/Lithic characteristics)
Arenite (Sedimentary rock composed of sand-sized grains)
Hardness: 6-7 on Mohs scale (due to quartz content); Color: Tan, beige, light brown; Luster: Dull/Earthy; Structure: Clastic; Gritty texture similar to sandpaper; Porous and often shows some layering.
- Hardness
- 6-7 on Mohs scale (due to quartz content)
- Color
- Tan, beige, light brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 on Mohs scale (due to quartz content); Color: Tan, beige, light brown; Luster: Dull/Earthy; Structure: Clastic; Gritty texture similar to sandpaper; Porous and often shows some layering.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. Typically deposited in river beds, beaches, or deserts and lithified over millions of years under pressure and heat.
Uses & applications
Commonly used in construction for paving, building facades, and grindstones. In geology, it is a significant reservoir for groundwater and oil/gas due to its porosity.
Geological facts
Sandstone accounts for roughly 20-25% of all sedimentary rock on Earth. The famous Red Rocks of Colorado and the carvings of Petra, Jordan, are both made of sandstone.
Field identification & locations
Identify in the field by its 'sandpaper' feel. It will not react with acid unless the cementing material is calcite. Grain size is key (0.06mm to 2mm). Found globally in sedimentary basins.
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