sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
AI-generated identification · may be incorrectHardness 6-7 (depends on clasts/matrix); multicolored with gray, brown, and black rounded to sub-angular clasts; earthy to dull luster; clastic texture.
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Physical properties
Hardness 6-7 (depends on clasts/matrix); multicolored with gray, brown, and black rounded to sub-angular clasts; earthy to dull luster; clastic texture.
Formation & geological history
Formed by the deposition and lithification of rounded gravel and pebble-sized clasts in high-energy aquatic environments like braided rivers or alluvial fans.
Uses & applications
Used primarily as crushed stone in construction, road base material, and occasionally as decorative dimension stone.
Geological facts
Mars rovers discovered Martian conglomerate rocks, proving that ancient, vigorously flowing water once existed on Mars.
Field identification & locations
Identified in the field by prominent, rounded pebbles cemented tightly within a finer sandy or muddy matrix; widely distributed globally in sedimentary basins.
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Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
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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