sedimentary
Conglomerate
Conglomerate (Sedimentary rock)
Hardness: variable depending on clasts (usually 3-7); Color: brownish to dark grey with visible clasts; Luster: dull/earthy; Structure: clastic texture with rounded to sub-angular pebbles bound in a finer sandy matrix.
- Hardness
- variable depending on clasts (usually 3-7)
- Color
- brownish to dark grey with visible clasts
- Luster
- dull/earthy
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Physical properties
Hardness: variable depending on clasts (usually 3-7); Color: brownish to dark grey with visible clasts; Luster: dull/earthy; Structure: clastic texture with rounded to sub-angular pebbles bound in a finer sandy matrix.
Formation & geological history
Formed by the lithification of rounded pebbles and gravel-sized clasts. These are typically deposited in high-energy environments like riverbeds or alluvial fans where water rounds the stones over time.
Uses & applications
Mainly used as a decorative stone in construction, concrete aggregate, and as a tool for understanding ancient river flow patterns in geology.
Geological facts
Conglomerate is often called "puddingstone" because the rounded clasts resemble raisins or fruit in a pudding. It is distinguishable from breccia by its rounded rather than angular clasts.
Field identification & locations
Identify by looking for distinct, rounded stones embedded in a finer-grained matrix. It is common in ancient riverbeds and coastal regions globally.
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