sedimentary
Conglomerate
Conglomerate
Hardness variable depending on clasts and matrix (typically 6-7 for quartz-rich), color is multicolored/gray with rounded pebble clasts, dull to earthy luster, clastic texture with rounded fragments greater than 2mm cemented together.
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Physical properties
Hardness variable depending on clasts and matrix (typically 6-7 for quartz-rich), color is multicolored/gray with rounded pebble clasts, dull to earthy luster, clastic texture with rounded fragments greater than 2mm cemented together.
Formation & geological history
Formed by the consolidation and cementation of gravel-sized rounded clasts in high-energy environments such as fast-flowing rivers, alluvial fans, or beach zones.
Uses & applications
Used primarily as crushed stone for construction, road aggregate, and occasionally as a decorative building stone.
Geological facts
Conglomerates are often referred to colloquially as "puddingstone" when they feature contrasting rounded pebbles set in a fine-grained matrix.
Field identification & locations
Easily identified in the field by its distinct "natural concrete" appearance containing visibly rounded pebbles or cobbles embedded in a finer matrix.
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Generic Pebble / Rock Fragment
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Sedimentary Sandstone
Arenite (Sedimentary Rock)
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Banded Siltstone / Mudstone Pebble
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