sedimentary
Conglomerate
Conglomeratic Sandstone
Hardness: 6-7 (Mohs scale) for clasts; Color: Mixed browns, grays, and tans; Luster: Dull to earthy; Texture: Clastic with rounded grains/pebbles embedded in a finer matrix.
- Hardness
- 6-7 (Mohs scale) for clasts
- Color
- Mixed browns, grays, and tans
- Luster
- Dull to earthy
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Physical properties
Hardness: 6-7 (Mohs scale) for clasts; Color: Mixed browns, grays, and tans; Luster: Dull to earthy; Texture: Clastic with rounded grains/pebbles embedded in a finer matrix.
Formation & geological history
Formed over millions of years by the lithification of rounded river gravel or beach pebbles in a high-energy environment like a fast-moving stream or shoreline.
Uses & applications
Primarily used as aggregate in the construction industry for road beds and concrete, occasionally used as decorative stone if well-indurated.
Geological facts
Known as 'puddingstone' in some regions, these rocks are essentially natural concrete composed of pre-existing rock fragments cemented together.
Field identification & locations
Identified by the presence of rounded rock fragments (clasts) larger than 2mm. Often found in ancient riverbeds. For collectors, look for unique colors or fossil inclusions within the clasts.
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