sedimentary

Flagstone

Sandstone or Limestone

Hardness 6-7 on Mohs scale, typically gray, brown, or red, dull to earthy luster, fine-grained clastic texture with prominent planar bedding planes.

Identified November 4, 2026More sedimentary →

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Physical properties

Hardness 6-7 on Mohs scale, typically gray, brown, or red, dull to earthy luster, fine-grained clastic texture with prominent planar bedding planes.

Formed through the accumulation and cementation of mineral particles or rock fragments in marine or terrestrial environments over millions of years.

Widely used in construction and landscaping for patios, walkways, wall cladding, and paving due to its natural flat splitting property.

Flagstone easily splits along natural bedding planes, making it a popular choice for masons seeking flat, irregularly shaped paving stones.

Identified in the field by its distinct flat slabs and visible sedimentary layers, commonly found in quarries worldwide.

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)