sedimentary
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
Hardness: 6-7 (based on quartz clasts); Color: Tan, brown, and grey; Luster: Dull/Earthy matrix with waxy clasts; Structure: Coarse-grained, clastic; Specific Gravity: 2.6-2.8
- Hardness
- 6-7 (based on quartz clasts)
- Color
- Tan, brown, and grey
- Luster
- Dull/Earthy matrix with waxy clasts
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Physical properties
Hardness: 6-7 (based on quartz clasts); Color: Tan, brown, and grey; Luster: Dull/Earthy matrix with waxy clasts; Structure: Coarse-grained, clastic; Specific Gravity: 2.6-2.8
Formation & geological history
Formed by the lithification of rounded gravel and pebbles in high-energy environments like riverbeds, alluvial fans, or beaches. Ages range from Precambrian to recent.
Uses & applications
Used as coarse aggregate for concrete, road base material, and occasionally as a decorative building stone or for gravel in landscaping.
Geological facts
Conglomerates are often referred to as 'puddingstone' in certain regions. The rounding of the clasts indicates they have been transported a significant distance by water.
Field identification & locations
Identify by looking for rounded pebbles (clasts) larger than 2mm cemented in a finer-grained matrix. Look for it in old river channels and mountain foothills.
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