sedimentary
Sandstone
Clastic sedimentary rock (primarily Quartz and Feldspar)
Hardness: 6-7 (Mohs scale) if quartz-rich; Color: Tan, beige, brown; Luster: Dull/Earthy; Crystal Structure: Clastic (granular texture); Cleavage: None (fractures across grains); Specific Gravity: 2.2 - 2.8.
- Hardness
- 6-7 (Mohs scale) if quartz-rich
- Color
- Tan, beige, brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale) if quartz-rich; Color: Tan, beige, brown; Luster: Dull/Earthy; Crystal Structure: Clastic (granular texture); Cleavage: None (fractures across grains); Specific Gravity: 2.2 - 2.8.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years. This specimen appears to be a coarse-grained sandstone likely formed in a riverbed or coastal environment.
Uses & applications
Widely used as a construction material for building façades, paving stones, and masonry. Fine varieties are used for grindstones or as a source of silica in glassmaking.
Geological facts
Sandstone accounts for about 20-25% of all sedimentary rocks on Earth. It is a major reservoir for groundwater, oil, and natural gas due to its high porosity and permeability.
Field identification & locations
Identify in the field by its 'sandpaper' feel when rubbed and the visible grain structure. Commonly found in sedimentary basins, canyons, and desert regions. It often displays bedding planes or layering.
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