sedimentary

Hag Stone

Perforated sedimentary rock

Hardness varies from 3 to 7 depending on mineral content; color ranges from tan to grey; dull luster; amorphous crystal structure.

Identified October 23, 2026More sedimentary →

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Physical properties

Hardness varies from 3 to 7 depending on mineral content; color ranges from tan to grey; dull luster; amorphous crystal structure.

Formed through natural water erosion and wave action wearing away softer mineral inclusions in sedimentary rock over thousands of years.

Historically used as a protective amulet against negative energy or witchcraft; popular among collectors and folklore enthusiasts.

Also known as an adder stone or hole stone, traditional folklore attributes magical protective properties to stones with naturally occurring holes.

Easily identified by a continuous hole bored straight through the rock by natural water currents; commonly found on beaches and riverbanks.

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)