sedimentary
Sedimentary Rock Fragments
Clastic Sedimentary Rock
Hardness varies between 3 and 7 depending on mineral content; colors include gray, brown, and tan; dull luster; fine to medium-grained texture.
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Physical properties
Hardness varies between 3 and 7 depending on mineral content; colors include gray, brown, and tan; dull luster; fine to medium-grained texture.
Formation & geological history
Formed from the accumulation, compaction, and cementation of mineral particles or rock fragments over geological timescales.
Uses & applications
Used in general aggregate, geological study, and educational displays.
Geological facts
Sedimentary rocks cover a large portion of the Earth's surface and often contain fossils that help date geological layers.
Field identification & locations
Commonly found in riverbeds, cliffs, and areas with historical water activity; identifiable by layered or granular appearance.
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Sandstone or Siltstone
Arenite (if sandstone)
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Sedimentary Sandstone
Arenite (Sedimentary Rock)
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Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
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Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
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Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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Shale
Shale (clastic sedimentary rock)
sedimentary