sedimentary

Sandstone and River Pebbles

Sedimentary Rock (Sandstone / Quartzite / Chert)

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale; Color: earthy brown, beige, grey, reddish tones; Luster: dull to earthy; Texture: granular to smooth (river-worn); Structure: clastic sedimentary.

Hardness: 6-7 on Mohs scale
Color: earthy brown, beige, grey, reddish tones
Luster: dull to earthy

Identified July 27, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: earthy brown, beige, grey, reddish tones; Luster: dull to earthy; Texture: granular to smooth (river-worn); Structure: clastic sedimentary.

Formation & geological history

Formed by the accumulation, compaction, and cementation of mineral particles or rock fragments, typically in riverbeds, lakes, or marine environments over millions of years.

Uses & applications

Commonly used in construction, landscaping, road base, and general rock collecting.

Geological facts

River-worn rocks get their smooth, rounded surfaces through years of hydraulic action and abrasion in moving streams and rivers.

Field identification & locations

Identified by granular surface texture, earthy colors, and rounded edges from water erosion. Extensively found along riverbanks, beaches, and sedimentary rock formations worldwide.