sedimentary

Mixed Rock Assortment

Polylithic geological specimens

Hardness varies from 3 to 7 on the Mohs scale depending on the specific stone. Colors include orange, brown, and grey with vitreous to dull lusters.

Identified November 3, 2026More sedimentary →

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Physical properties

Hardness varies from 3 to 7 on the Mohs scale depending on the specific stone. Colors include orange, brown, and grey with vitreous to dull lusters.

Formed through various geological processes including sedimentary deposition and weathering found in regional alluvial deposits.

Used for rock collecting, lapidary arts, and educational displays.

This assortment displays a range of different mineral compositions typically found in mixed gravel deposits.

Identify by testing hardness and inspecting grain structures. Common in riverbeds and surface gravels.

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

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Sandstone or Siltstone

Arenite (if sandstone)

Sandstone

Arenite

Shale

Shale (clastic sedimentary rock)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)