sedimentary
Puddingstone
Conglomerate
AI-generated identification · may be incorrectHardness varies based on clasts and matrix, often 6-7 if quartz-rich; color consists of a light matrix with distinct rounded reddish clasts; coarse-grained.
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Physical properties
Hardness varies based on clasts and matrix, often 6-7 if quartz-rich; color consists of a light matrix with distinct rounded reddish clasts; coarse-grained.
Formation & geological history
Formed in high-energy sedimentary environments like fast-flowing rivers or glacial outwash, where rounded pebbles (clasts) are deposited and later cemented together by finer sediment (matrix).
Uses & applications
Decorative landscaping, polishing, local lapidary arts, and collecting.
Geological facts
Puddingstone is named for its resemblance to traditional plum pudding, with the dark pebbles looking like raisins or plums in a lighter dough.
Field identification & locations
Easily identified by the contrast between the rounded pebbles, often red jasper or quartzite, and the lighter colored matrix. Common in certain glacial deposits and riverbeds.
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