sedimentary

Sandstone (likely Quartzose Sandstone pebble)

Arenite (primarily SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale (if quartz-rich); Color: Tan, beige, or light brown with visible sand-sized grains; Luster: Dull/Earthy; Crystal structure: Clastic (composed of rounded mineral grains); Cleavage: None (grains are cemented together); Specific gravity: Approx 2.2-2.8

Hardness: 6-7 on Mohs scale (if quartz-rich)
Color: Tan, beige, or light brown with visible sand-sized grains
Luster: Dull/Earthy

Identified March 7, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation of sand-sized mineral particles or rock fragments, which are then compacted and cemented together by pressure and minerals like silica or calcite over millions of years. This specimen shows signs of water-worn erosion, likely from a riverbed or coastal environment.

Uses & applications

Major construction material, used in the manufacture of glass (if high purity silica), as decorative landscaping stones, or as a building material for aquifers and oil reservoirs.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. Because of its porosity, it is one of the most important rocks for storing ground water and fossil fuels deep underground.

Field identification & locations

Identify in the field by its 'sandpaper' texture and the presence of visible grains between 0.06mm and 2mm. Usually found in desert regions, ancient river beds, or beaches. Collectors should look for unique banding (liesegang rings) or fossil inclusions.