sedimentary
Conglomerate
Clastic Sedimentary Rock
AI-generated identification · may be incorrectHardness varies (3-7 depending on clasts), color is typically brownish-grey, dull luster, composed of rounded gravel-sized clasts cemented together by a matrix of sand, silt, or calcite.
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Physical properties
Hardness varies (3-7 depending on clasts), color is typically brownish-grey, dull luster, composed of rounded gravel-sized clasts cemented together by a matrix of sand, silt, or calcite.
Formation & geological history
Formed in high-energy environments like fast-flowing rivers or beach zones where rounded pebbles accumulate and undergo lithification over millions of years.
Uses & applications
Used primarily in the construction industry as crushed aggregate for road building and concrete production.
Geological facts
The rounded shape of the constituent clasts proves that the sediments traveled a significant distance via water transport before deposition.
Field identification & locations
Easily identified in the field by its distinct 'plum pudding' texture of visible rounded pebbles embedded in a finer-grained matrix; found worldwide.
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Other sedimentary specimens
Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image
fossil
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary