sedimentary

Sandstone (Quartzose)

Arenite (primarily SiO2)

Hardness: 6-7 on Mohs scale; Color: Gray, tan, and light brown; Luster: Dull/Earthy; Crystal Structure: Clastic grain texture; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 on Mohs scale
Color: Gray, tan, and light brown
Luster: Dull/Earthy

Identified June 25, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Gray, tan, and light brown; Luster: Dull/Earthy; Crystal Structure: Clastic grain 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 river beds, beaches, or deserts. This rounded specimen indicates significant transport by water (river or beach erosion).

Uses & applications

Commonly used as a construction material, for paving stones, in the glass-making industry (if high silica content), and as a reservoir rock for oil and gas.

Geological facts

Sandstone accounts for about 10-20% of the Earth's sedimentary rocks. Famous structures like the treasury at Petra are carved entirely out of sandstone cliffs.

Field identification & locations

Identify in the field by its 'sandpaper' feel and visible grains. Often found in riverbeds or near coastal areas. Use a magnifying glass to see the individual rounded grains and cementation.