sedimentary
Sandstone (Pebble)
Arenite (composed primarily of SiO2)
Hardness: 6-7 (Mohs scale); Color: Tan, brown, and reddish-orange due to iron oxide staining; Luster: Dull/Earthy; Crystal structure: Clastic (grainy texture); Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs scale)
- Color
- Tan, brown, and reddish-orange due to iron oxide staining
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Tan, brown, and reddish-orange due to iron oxide staining; Luster: Dull/Earthy; Crystal structure: Clastic (grainy 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. This specific specimen has been significantly rounded by fluvial or marine erosion, indicating a history in a riverbed or shoreline.
Uses & applications
Used in construction, landscaping as decorative pebbles, and as a reservoir rock for oil and natural gas in geological basins.
Geological facts
Sandstone accounts for roughly 20 to 25 percent of all sedimentary rocks in the Earth's crust. Its high porosity makes it a valuable aquifer for groundwater.
Field identification & locations
Identify by its 'sandpaper' feel and visible grains under magnification. Commonly found in riverbeds, beaches, and desert environments. For collectors, look for unique weathering patterns or banding.
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