sedimentary

Mixed Rock Collection

Polymineralic aggregate

Hardness varies from 6 to 7 on the Mohs scale; displays diverse colors including yellow, black, red, and tan; lusters range from vitreous to dull.

Identified November 6, 2026More sedimentary →

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Physical properties

Hardness varies from 6 to 7 on the Mohs scale; displays diverse colors including yellow, black, red, and tan; lusters range from vitreous to dull.

Formed through various geological processes including sedimentary deposition and weathering over millions of years.

Used primarily in lapidary collections, decorative landscaping, and educational displays.

These specimens represent a diverse assortment of silicate-rich rock types commonly gathered from surface deposits.

Identify in the field by checking streak, hardness, and visible mineral grains. Commonly found in riverbeds and glacial drift.

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)