sedimentary
Conglomerate (Puddingstone)
Conglomerate (Clastic Sedimentary Rock)
Hardness: Variable (6-7 for quartz clasts); Color: Dark grey matrix with tan/cream rounded inclusions; Luster: Dull/Earthy; Structure: Clastic with rounded clasts; Cleavage: None.
- Hardness
- Variable (6-7 for quartz clasts)
- Color
- Dark grey matrix with tan/cream rounded inclusions
- Luster
- Dull/Earthy
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Physical properties
Hardness: Variable (6-7 for quartz clasts); Color: Dark grey matrix with tan/cream rounded inclusions; Luster: Dull/Earthy; Structure: Clastic with rounded clasts; Cleavage: None.
Formation & geological history
Formed through the lithification of rounded river or coastal gravel. The clasts suggest a high-energy environment like a fast-moving stream. Ages vary but often represent ancient riverbeds.
Uses & applications
Commonly used as a decorative stone in landscaping, a coarse aggregate in construction, or kept as curiosities by collectors if the patterns are distinct.
Geological facts
This specific specimen shows 'clast-supported' structure where a harder, lighter-colored pebble is embedded in a finer-grained matrix. Often called 'Puddingstones' when the colors contrast sharply.
Field identification & locations
Identify by looking for rounded pebbles (clasts) fused within a finer-grained 'cement.' Commonly found in glacial till, riverbeds, and coastal regions with significant erosion history.
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