sedimentary
Hag Stone
Perforated sedimentary rock (typically limestone, sandstone, or flint)
Hardness varies from 3 to 7 on the Mohs scale depending on base mineral; colors range from grey, blue, to brown; dull to earthy luster; amorphous crystal structure; specific gravity around 2.5-2.7
Identified More sedimentary →
Explore Hag Stone in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness varies from 3 to 7 on the Mohs scale depending on base mineral; colors range from grey, blue, to brown; dull to earthy luster; amorphous crystal structure; specific gravity around 2.5-2.7
Formation & geological history
Formed through natural weathering and erosion, typically where softer mineral inclusions or fossils within a sedimentary rock have been completely dissolved or eroded away by water action, leaving a hole.
Uses & applications
Used historically as a protective talisman, amulet, or charm in folklore; currently collected as a novelty or curiosities item.
Geological facts
Also known as adder stones, witch stones, or hole stones, traditional folklore holds that looking through the hole allows one to see fairies, witches, or hidden magical realms.
Field identification & locations
Found along riverbanks, lakeshores, and beaches where wave action or running water has continuously tumbled and eroded the stone; identified by the naturally occurring hole entirely through the rock.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
sedimentary