sedimentary
Conglomerate
Conglomerate
Hardness: variable (depends on clasts); Color: brown, tan, gray; Luster: dull; Structure: clastic; Cleavage: none; SG: 2.2-2.8
- Hardness
- variable (depends on clasts)
- Color
- brown, tan, gray
- Luster
- dull
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Physical properties
Hardness: variable (depends on clasts); Color: brown, tan, gray; Luster: dull; Structure: clastic; Cleavage: none; SG: 2.2-2.8
Formation & geological history
Formed by the consolidation of rounded gravel or pebbles (clasts) greater than 2mm, usually in riverbeds, shorelines, or alluvial fans through lithification.
Uses & applications
Used primarily in the construction industry as fill material, road aggregate, or occasionally as ornamental building stone.
Geological facts
Conglomerate is often called "puddingstone" because the rounded clasts resemble fruit in a pudding. It preserves records of high-energy ancient water systems.
Field identification & locations
Identify in the field by looking for large, rounded rock fragments embedded within a finer-grained matrix. Found globally in ancient river basins.
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