sedimentary

Sandstone / Chert Pebble

Silicon Dioxide / Sedimentary Rock (SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale. Color: Tan, beige, light brownish-grey. Luster: Dull, earthy to sub-vitreous. Fracture: Conchoidal to uneven. Grain size: Fine to medium.

Hardness: 6-7 on Mohs scale
Color: Tan, beige, light brownish-grey
Luster: Dull, earthy to sub-vitreous

Identified July 22, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale. Color: Tan, beige, light brownish-grey. Luster: Dull, earthy to sub-vitreous. Fracture: Conchoidal to uneven. Grain size: Fine to medium.

Formation & geological history

Formed through the accumulation, compaction, and cementation of mineral particles or rock fragments, often in riverbeds, lakes, or marine environments, followed by natural erosion into pebble form.

Uses & applications

Common landscaping rock, construction aggregate, or general gravel. Minor interest to rockhounding beginners.

Geological facts

Small weathered pebbles like this are amongst the most common rocks found on Earth's surface, shaped over thousands of years by water and wind erosion.

Field identification & locations

Identified by its fine grain, dull earthy tan color, and rounded/sub-angular weathered edges. Commonly found along riverbeds, gravel paths, beaches, and soil deposits.