sedimentary

Sandstone Pebble

Arenite (SiO2 primarily)

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

Identified June 24, 2026More sedimentary →

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Physical properties

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

Formation & geological history

Formed through the accumulation and litification of sand-sized mineral grains or rock fragments, typically in riverbeds, beaches, or desert environments. This specimen appears water-worn (rounded) by fluvial or coastal erosion.

Uses & applications

Used extensively in construction as a building material and road aggregate. Highly weathered pebbles are primarily of interest to hobbyist collectors or used in decorative landscaping.

Geological facts

Sandstone represents about 20% of all sedimentary rocks on Earth. The rounded shape of this specimen indicates it has spent significant time being tumbled in water, which smoothed its edges.

Field identification & locations

Identify in the field by its gritty, sand-like texture when rubbed and its lack of visible crystals. Commonly found in riverbeds, shorelines, and sedimentary basins worldwide.