sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
Hardness: 6-7 (Mohs scale), Color: tan, grey, or light green, Luster: dull/earthy, Structure: granular and clastic, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan, grey, or light green, Luster: dull/earthy, Structure: granular and clastic, Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in river beds, deserts, or marine environments over millions of years.
Uses & applications
Used extensively in construction as a building material, paving, and in the manufacturing of glass and abrasives.
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks on Earth and is often a primary reservoir for underground water (aquifers) and oil/gas.
Field identification & locations
Identify in the field by its gritty, sand-paper like texture even when weathered. Look for bedding planes or layers. Found globally in basins and mountainous regions.
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