sedimentary
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
Hardness: 3-7 (variable based on clasts/matrix); Color: Tan/beige matrix with dark rounded clasts; Luster: Dull/earthy; Structure: Clastic with rounded grains >2mm.
- Hardness
- 3-7 (variable based on clasts/matrix)
- Color
- Tan/beige matrix with dark rounded clasts
- Luster
- Dull/earthy
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Physical properties
Hardness: 3-7 (variable based on clasts/matrix); Color: Tan/beige matrix with dark rounded clasts; Luster: Dull/earthy; Structure: Clastic with rounded grains >2mm.
Formation & geological history
Formed by the lithification of rounded gravel and pebbles, typically in high-energy environments like riverbeds, alluvial fans, or beaches where water action rounds the stones over time.
Uses & applications
Primarily used as aggregate in the construction industry for concrete and road beds; sometimes used as decorative dimension stone.
Geological facts
Conglomerate is often called 'puddingstone' because it looks like raisins or nuts in a pudding. It is a key indicator of ancient river systems or coastal environments in the geologic record.
Field identification & locations
Identify by looking for rounded rock fragments (clasts) cemented together in a finer-grained matrix. Found globally in basins where sediment is deposited by moving water.
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