sedimentary
Conglomerate
Clastic Sedimentary Conglomerate
Hardness: 6-7 (depending on clast composition); Color: Gray, tan, brown with a reddish clast; Luster: Dull/Earthy; Structure: Clastic with rounded fragments (clasts) larger than 2mm embedded in a finer matrix.
- Hardness
- 6-7 (depending on clast composition)
- Color
- Gray, tan, brown with a reddish clast
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (depending on clast composition); Color: Gray, tan, brown with a reddish clast; Luster: Dull/Earthy; Structure: Clastic with rounded fragments (clasts) larger than 2mm embedded in a finer matrix.
Formation & geological history
Formed through the lithification of rounded gravel and cobbles typically deposited in high-energy environments like riverbeds, alluvial fans, or beaches. Geological age varies widely from Precambrian to Cenozoic.
Uses & applications
Used primarily in the construction industry as coarse aggregate for concrete and road fill; occasionally used as a decorative stone in landscaping or interior design.
Geological facts
Conglomerate is often called 'puddingstone' because the rounded clasts resemble raisins in a pudding. It is distinguishable from breccia by its rounded rather than angular fragments.
Field identification & locations
Identify in the field by looking for 'concrete-like' appearance with obviously rounded stones cemented together. Commonly found in sedimentary basins and ancient stream beds.
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