sedimentary

Sandstone (Quartzose Sandstone Pebble)

Arenite (primarily SiO2)

Hardness: 6-7 on Mohs scale; Color: Tan, beige, or grey with visible sand-sized grains; Luster: Dull/Earthy; Crystal Structure: Clastic (grains held by mineral cement); Cleavage: None; Specific Gravity: 2.3–2.4

Hardness: 6-7 on Mohs scale
Color: Tan, beige, or grey with visible sand-sized grains
Luster: Dull/Earthy

Identified March 21, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation and litification of sand-sized mineral particles or rock fragments. This specific specimen is a 'well-rounded pebble,' indicating it has undergone significant mechanical weathering and transport in a high-energy water environment like a river or beach.

Uses & applications

Commonly used in the construction industry as an aggregate, for pavers, and as decorative landscape stone. Siliceous varieties are used in glass manufacturing.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The rounding of such pebbles can take thousands of years of tumbling in water to achieve this smooth, egg-like shape.

Field identification & locations

Identify in the field by its gritty texture (feels like sandpaper) and visible individual grains. This specimen shows a faint bedding plane or small quartz vein. Commonly found in riverbeds and coastal regions worldwide.

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