sedimentary

Banded Sandstone

Sedimentary Quartz Arenite

Mohs hardness 7, displays distinct purple and beige color banding, vitreous to dull luster, and quartz crystal structure.

Identified October 19, 2026More sedimentary →

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Physical properties

Mohs hardness 7, displays distinct purple and beige color banding, vitreous to dull luster, and quartz crystal structure.

Formed through the accumulation, compaction, and cementation of mineral particles over millions of years in desert or beach environments.

Used primarily in landscaping, decorative items, and architectural cladding.

The distinctive purple bands are typically caused by iron oxide or hematite staining within the silica matrix.

Easily identified by its layered banding and hard quartz grains; commonly found in riverbeds and coastal areas.

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)