sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
AI-generated identification · may be incorrectHardness varies (clasts 6-7 if quartz, matrix 3-5); color is a mix of browns, oranges, and grays; dull luster; clastic texture with rounded fragments >2mm in a fine-grained matrix.
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Physical properties
Hardness varies (clasts 6-7 if quartz, matrix 3-5); color is a mix of browns, oranges, and grays; dull luster; clastic texture with rounded fragments >2mm in a fine-grained matrix.
Formation & geological history
Formed through the accumulation and subsequent lithification of rounded water-worn pebbles and gravel, typically in high-energy environments like riverbeds or alluvial fans.
Uses & applications
Used primarily in construction as coarse aggregate for concrete and roadbeds; decorative specimens are used in landscaping or as collector samples.
Geological facts
Commonly known as 'puddingstone' in certain regions (like Michigan or the UK) when the clasts contrast sharply with the matrix. It is a key indicator for geologists of past water flow.
Field identification & locations
Identify by looking for rounded rock fragments (clasts) cemented together; found globally in ancient riverbeds. For collectors, look for unique colors or varied pebble types.
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