sedimentary

Grey Pebble (Sandstone / Quartzite Pebble)

Sedimentary rock (primarily Quartz - SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale; Color: Dull light grey to greenish-grey; Luster: Matte to dull; Grain size: Fine to medium-grained; Texture: Smooth, water-worn sub-rounded pebble shape.

Hardness: 6-7 on Mohs scale
Color: Dull light grey to greenish-grey
Luster: Matte to dull

Identified July 26, 2026More sedimentary →

Explore Grey Pebble (Sandstone / Quartzite Pebble) in the encyclopedia →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Dull light grey to greenish-grey; Luster: Matte to dull; Grain size: Fine to medium-grained; Texture: Smooth, water-worn sub-rounded pebble shape.

Formation & geological history

Formed through the accumulation, compaction, and cementation of mineral particles or rock fragments, followed by mechanical erosion and smoothing in a fluvial or coastal beach environment.

Uses & applications

Commonly used as decorative landscaping pebbles, aggregate in construction, or for rock tumbling and painting projects.

Geological facts

Smooth river or beach pebbles acquire their rounded, soft shape from millions of collisions with other stones and water action over long periods.

Field identification & locations

Identified by its small, smooth, rounded appearance and uniform fine-grained texture. Commonly found along riverbanks, lakeshores, gravel pits, and oceanic beaches worldwide.