sedimentary
Sandstone and River Pebbles
Sedimentary Rock (Sandstone / Quartzite / Chert)
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
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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.
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