sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite
Hardness: 6-7 on Mohs scale (due to quartz content); Color: Tan, beige, or light brown; Luster: Dull or earthy; Crystal Structure: Clastic texture with visible sand-sized grains; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 on Mohs scale (due to quartz content)
- Color
- Tan, beige, or light brown
- Luster
- Dull or earthy
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Physical properties
Hardness: 6-7 on Mohs scale (due to quartz content); Color: Tan, beige, or light brown; Luster: Dull or earthy; Crystal Structure: Clastic texture with visible sand-sized grains; Specific Gravity: 2.2-2.8
Formation & geological history
Formed from the accumulation and lithification of sand-sized mineral grains or rock fragments, typically in environments like deserts, river deltas, or beaches. Geological age can range from Precambrian to Holocene.
Uses & applications
Used widely as a construction material (dimension stone), in glass manufacturing if high in silica, for grindstones, and as decorative garden features.
Geological facts
Sandstone is often an excellent aquifer or reservoir for petroleum and natural gas because of its porosity and permeability. The Red Rocks Amphitheatre in Colorado is a famous landform made of sandstone.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible layers or bedding planes. It is commonly found in sedimentary basins and canyonlands. Collectors look for unique banding or fossil inclusions.
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