sedimentary
Sandstone (Quartzose)
Sandstone (clastic sedimentary rock, primarily SiO2)
Hardness: 6-7 (individual grains); Color: tan, buff, or light brown with visible quartz grains; Luster: dull to earthy; Crystal structure: granular clastic texture; Cleavage: none; Specific gravity: 2.2-2.8
- Hardness
- 6-7 (individual grains)
- Color
- tan, buff, or light brown with visible quartz grains
- Luster
- dull to earthy
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Physical properties
Hardness: 6-7 (individual grains); Color: tan, buff, or light brown with visible quartz grains; Luster: dull to earthy; Crystal structure: granular clastic texture; Cleavage: none; 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 environments like deserts, river deltas, or beaches. Likely from the Phanerozoic eon.
Uses & applications
Widely used for construction, building facades, abrasive projects, and as a reservoir rock for oil, natural gas, and groundwater.
Geological facts
Sandstone represents about 20% of all sedimentary rocks on Earth. The famous red rock formations in places like Sedona and the Grand Canyon are primarily types of sandstone.
Field identification & locations
Identify in the field by its gritty, sandpaper-like feel and visible grains. Often displays bedding planes or layering. Look for it in areas with historical water activity or cliff faces.
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