sedimentary
Sandstone (Quartzite-rich)
Clastic sedimentary rock (SiO2 primarily)
Hardness: 6-7 Mohs; Color: Tan, beige, light brown; Luster: Dull to earthy; Crystal structure: Granular/fragmental; Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 Mohs
- Color
- Tan, beige, light brown
- Luster
- Dull to earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan, beige, light brown; Luster: Dull to earthy; Crystal structure: Granular/fragmental; Cleavage: None; Specific gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains, typically quartz. This specimen shows significant rounding, suggesting it was transported and eroded by water in a riverbed or coastal environment.
Uses & applications
Commonly used in construction for road base, concrete aggregate, and as a dimension stone for landscaping; occasionally used for making sharpening stones.
Geological facts
Sandstone accounts for approximately 25 percent of the sedimentary rocks in the Earth's crust. Its porous nature makes it a vital reservoir for groundwater and petroleum.
Field identification & locations
Identify by a 'sandpaper' feel and visible grains. Often found in riverbeds, canyons, and desert regions worldwide. Collectors look for unique weathering patterns or fossils within the matrix.
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