sedimentary

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (Lithic arenite / Quartz arenite)

Hardness: 6-7 on Mohs scale (due to quartz content); Color: Tan, beige, off-white; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None (fractures across grains); Specific Gravity: 2.2 - 2.8.

Hardness: 6-7 on Mohs scale (due to quartz content)
Color: Tan, beige, off-white
Luster: Dull/Earthy

Identified April 14, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments. This specimen appears water-worn, likely from a riverbed or coastal environment where mechanical weathering rounded its edges.

Uses & applications

Commonly used as a construction material (building stone), as an abrasive in industrial processes, and as a reservoir rock for oil and natural gas in geological formations.

Geological facts

Sandstone accounts for approximately 20% of all sedimentary rocks on Earth. Its porosity makes it an excellent natural filter for groundwater and a vital aquifer material.

Field identification & locations

Identify in the field by its sandpaper-like feel and visible grains. It is extremely common worldwide, especially in arid regions or ancient river systems. Use a hand lens to see individual sand grains held together by a mineral cement like silica or calcite.

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