sedimentary
Conglomerate
Conglomeratic Sandstone
Hardness: variable (matrix 3-5, clasts 7); Color: brown, tan, gray; Luster: earthy; Texture: clastic with rounded pebbles; Cleavage: none; SG: 2.1-2.6
- Hardness
- variable (matrix 3-5, clasts 7)
- Color
- brown, tan, gray
- Luster
- earthy
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Physical properties
Hardness: variable (matrix 3-5, clasts 7); Color: brown, tan, gray; Luster: earthy; Texture: clastic with rounded pebbles; Cleavage: none; SG: 2.1-2.6
Formation & geological history
Formed by the lithification of rounded gravel and pebbles, typically in high-energy environments like riverbeds or alluvial fans. Usually found in ancient sedimentary basins.
Uses & applications
Primarily used as a low-grade construction aggregate, decorative stone in masonry, or as a landscape rock. Significant for identifying ancient water flow patterns.
Geological facts
Conglomerate is often called Puddingstone because the pebbles look like raisins in a pudding. It indicates the rock was once part of a high-energy river system.
Field identification & locations
Identify by the presence of large, rounded clasts cemented in a finer matrix. Often found in river valleys and mountain runoff areas.
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