sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
Hardness: 6-7 (based on quartz clasts); Color: Tan, brown, and white; Luster: Dull/Earthy matrix with vitreous clasts; Structure: Clastic, coarse-grained rounded pebbles cemented in a fine-grained matrix; Cleavage: None.
- Hardness
- 6-7 (based on quartz clasts)
- Color
- Tan, brown, and white
- Luster
- Dull/Earthy matrix with vitreous clasts
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Physical properties
Hardness: 6-7 (based on quartz clasts); Color: Tan, brown, and white; Luster: Dull/Earthy matrix with vitreous clasts; Structure: Clastic, coarse-grained rounded pebbles cemented in a fine-grained matrix; Cleavage: None.
Formation & geological history
Formed through the lithification of rounded gravel and pebbles, typically in high-energy environments like riverbeds, alluvial fans, or beaches where water movement rounds the stones.
Uses & applications
Used primarily in the construction industry as coarse aggregate for concrete, road base, and occasionally as decorative stone or fill material.
Geological facts
Conglomerate is often called a 'puddingstone' because it looks like raisins or nuts in a pudding. It indicates a past environment with strong water currents capable of transporting heavy stones.
Field identification & locations
Identify by looking for rounded, smooth stones of varying sizes bound together by a natural mineral cement. Commonly found in sedimentary basins and ancient river channels.
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