sedimentary
Conglomerate Pebble (with Chert / Quartz)
Sedimentary Conglomerate / Breccia Pebble
Hardness: 6-7 on Mohs scale (quartz/chert matrix); Color: Tan, beige, grey, and light brown; Luster: Dull to earthy; Texture: Fine to medium-grained with embedded clasts; Cleavage: None.
- Hardness
- 6-7 on Mohs scale (quartz/chert matrix)
- Color
- Tan, beige, grey, and light brown
- Luster
- Dull to earthy
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Physical properties
Hardness: 6-7 on Mohs scale (quartz/chert matrix); Color: Tan, beige, grey, and light brown; Luster: Dull to earthy; Texture: Fine to medium-grained with embedded clasts; Cleavage: None.
Formation & geological history
Formed by the accumulation, compaction, and cementation of rounded to sub-angular rock fragments and mineral grains carried by ancient rivers, streams, or coastal waters.
Uses & applications
Commonly used as construction aggregate, landscaping pebbles, and as educational specimens for studying sedimentary rock formation.
Geological facts
Sedimentary rocks like conglomerates capture snapshots of ancient river systems, reflecting the energy of the water flow that once transported the fragments.
Field identification & locations
Identified by the rounded to sub-angular inclusions embedded in a fine-grained sandy or silty matrix. Widespread in riverbeds, glacial deposits, and sedimentary basins worldwide.
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