sedimentary

Sandstone (Quartzose)

Arenite (SiO2 based)

Hardness: 6-7 (Mohs scale); Color: Tan, beige, light brown; Luster: Dull/Earthy; Crystal Structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale)
Color: Tan, beige, light brown
Luster: Dull/Earthy

Identified June 13, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Tan, beige, light brown; Luster: Dull/Earthy; Crystal Structure: Clastic/Granular; 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 riverbeds, deserts, or coastal environments. This specimen shows significant rounding, indicating fluvial (water-worn) transport.

Uses & applications

Used in construction as a building material, aggregate for concrete, and for craft projects like rock painting or rustic landscaping.

Geological facts

Sandstone accounts for approximately 10 to 20 percent of the sedimentary rocks on Earth. It is a major reservoir for groundwater and petroleum products due to its porosity.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and visible sand grains. This specific specimen is a 'river cobble,' commonly found in stream beds and glacial deposits.