sedimentary
Conglomerate
Conglomerate (Clastic Sedimentary Rock)
Hardness: 6-7 (driven by quartz content); Color: Pinkish-red, tan, brown; Luster: Dull to earthy; Texture: Coarse-grained with rounded clasts (>2mm) in a finer-grained matrix.
- Hardness
- 6-7 (driven by quartz content)
- Color
- Pinkish-red, tan, brown
- Luster
- Dull to earthy
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Physical properties
Hardness: 6-7 (driven by quartz content); Color: Pinkish-red, tan, brown; Luster: Dull to earthy; Texture: Coarse-grained with rounded clasts (>2mm) in a finer-grained matrix.
Formation & geological history
Formed through the lithification of rounded gravel and boulders. These are typically deposited in high-energy environments like fast-flowing rivers or beaches where water action rounds the rock fragments over time. Often millions of years old.
Uses & applications
Used primarily in the construction industry as coarse aggregate for concrete or fill. Some attractive specimens are used for decorative landscaping or dimension stone.
Geological facts
Conglomerates are often called 'pudding stones' due to their appearance looking like raisins or fruit in a pudding. They are key indicators for geologists of ancient riverbeds or shoreline environments.
Field identification & locations
Identify by looking for rounded, water-worn pebbles or stones cemented together in a solid mass. Commonly found in sedimentary basins and near old glacial deposits. Of interest to collectors for the variety of minerals contained within the clasts.
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