sedimentary

Sandstone (River Pebble)

Arenite

Hardness: 6-7 (Mohs); Color: Grey with tan banding; Luster: Dull/Earthy; Crystal structure: Clastic (grains); Cleavage: None; Texture: Gritty, sandpaper-like feel.

Hardness: 6-7 (Mohs)
Color: Grey with tan banding
Luster: Dull/Earthy

Identified April 10, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Grey with tan banding; Luster: Dull/Earthy; Crystal structure: Clastic (grains); Cleavage: None; Texture: Gritty, sandpaper-like feel.

Formation & geological history

Formed from the accumulation and cementation of sand-sized mineral grains (primarily quartz). This specific specimen shows 'well-rounded' maturity, indicating significant transport by water in a river or coastal environment during the Holocene to Pleistocene epochs.

Uses & applications

Common sandstone is used in construction as an aggregate or building stone. When found as river rocks, they are used primarily for landscaping, decorative garden features, and stone painting.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. The rhythmic banding visible in this stone represents different layers of sediment deposition over time.

Field identification & locations

Identify by its gritty texture (rubbing it might release sand grains) and visible layering (bedding). Commonly found in riverbeds, beaches, and desert basins worldwide.