sedimentary
Hag Stone
Perforated sedimentary rock (typically flint, chert, or limestone)
Hardness varies by mineral composition (typically 6-7 on Mohs scale for chert/flint); colors range from gray, brown, tan to reddish; dull to waxy luster; cryptocrystalline structure with no true cleavage.
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Physical properties
Hardness varies by mineral composition (typically 6-7 on Mohs scale for chert/flint); colors range from gray, brown, tan to reddish; dull to waxy luster; cryptocrystalline structure with no true cleavage.
Formation & geological history
Formed through natural weathering processes where softer inclusions or fossils within a sedimentary rock (like limestone or chalk) erode away completely, leaving a hole through the rock. Often shaped by water action in rivers or coastal environments.
Uses & applications
Used historically as a talisman or amulet for protection against negative energy, nightmares, and witchcraft; collected as a curiosity or good luck charm.
Geological facts
Also known as an adder stone, witch stone, or holy stone, hag stones have rich folklore histories across various cultures, often associated with fairy lore and sight-granting properties when peered through.
Field identification & locations
Easily identified by the naturally formed hole running entirely through the rock. Found commonly along riverbeds, beaches, and areas with high glacial or water erosion.
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