sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
Hardness: variable based on matrix and clasts (typically 6-7 if quartz-rich); Color: Tan, white, and earthy tones with visible rounded pebbles; Luster: Dull to earthy; Structure: Clastic with rounded clasts; Cleavage: None
- Color
- Tan, white, and earthy tones with visible rounded pebbles
- Luster
- Dull to earthy
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Physical properties
Hardness: variable based on matrix and clasts (typically 6-7 if quartz-rich); Color: Tan, white, and earthy tones with visible rounded pebbles; Luster: Dull to earthy; Structure: Clastic with rounded clasts; Cleavage: None
Formation & geological history
Formed through 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 a low-grade construction aggregate, fill material, and occasionally as a decorative stone in landscaping or interior design (puddingstone).
Geological facts
Conglomerate is often referred to as 'puddingstone' because its appearance resembles a fruit pudding. It is the sedimentary equivalent of a breccia, which contains angular rather than rounded fragments.
Field identification & locations
Identify in the field by looking for rounded pebbles (clasts) larger than 2mm cemented in a finer-grained matrix. Commonly found in ancient river systems and mountain basins.
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