sedimentary

Sandstone Pebble

Sandstone

Hardness: 6-7 on Mohs scale. Color: Dull grey to brownish-grey. Luster: Dull, earthy. Texture: Medium-grained, sand-like feel with a rounded, smooth pebble shape from water erosion.

Hardness: 6-7 on Mohs scale
Color: Dull grey to brownish-grey
Luster: Dull, earthy

Identified July 26, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale. Color: Dull grey to brownish-grey. Luster: Dull, earthy. Texture: Medium-grained, sand-like feel with a rounded, smooth pebble shape from water erosion.

Formation & geological history

Formed through the accumulation, compaction, and cementation of mineral particles or rock fragments (predominantly quartz and feldspar). The rounded shape indicates it was tumbled by river or ocean water over an extended period.

Uses & applications

Commonly used in landscaping, river rock decor, construction aggregate, and as general decorative stones. Smooth pebbles are also frequently used in stone carving, crafts, or massage therapy.

Geological facts

Smooth river rocks or beach pebbles get their rounded shape from abrasion as water rolls them against other rocks over thousands of years.

Field identification & locations

Identified by its fine sand-like grain texture, matte grey color, and well-rounded, water-worn shape. Frequently found along riverbeds, lakeshores, and oceanic beaches.