sedimentary
Hag Stone (Odin Stone / Adder Stone)
Perforated Pebble (commonly Chert, Mudstone, or Limestone)
AI-generated identification · may be incorrectHardness varies from 3 to 7 Mohs depending on rock composition, matte earthy brown color, dull to earthy luster, microcrystalline or fine-grained texture, featuring naturally eroded boreholes.
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Physical properties
Hardness varies from 3 to 7 Mohs depending on rock composition, matte earthy brown color, dull to earthy luster, microcrystalline or fine-grained texture, featuring naturally eroded boreholes.
Formation & geological history
Formed in marine, riverine, or coastal environments where water flow, abrasive sand, or boring organisms (such as piddock clams) erode small holes through soft spots in pebbles over long periods.
Uses & applications
Used historically as protective amulets, folklore talismans to ward off evil spirits or nightmares, and held in curiosity collections.
Geological facts
According to European folklore, looking through the natural hole of a hag stone allows a person to see fairies, witches, or hidden truths.
Field identification & locations
Identify by inspecting the hole to ensure it is naturally eroded by water or biological activity rather than drilled artificially. Commonly found along beaches, riverbeds, and gravel deposits.
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