Rock Identifier
Hag Stone (Perforated Sedimentary Rock (Typically Limestone or Sandstone)) — sedimentary
sedimentary

Hag Stone

Perforated Sedimentary Rock (Typically Limestone or Sandstone)

Hardness varies between 3 and 7 on the Mohs scale depending on the rock type (often limestone with hardness 3 or sandstone with hardness 6-7); Color ranges from off-white, beige, grey, to brown; Luster is dull to earthy; Structure is microcrystalline or clastic with naturally eroded holes; Cleavage is none;…

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Physical properties

Hardness varies between 3 and 7 on the Mohs scale depending on the rock type (often limestone with hardness 3 or sandstone with hardness 6-7); Color ranges from off-white, beige, grey, to brown; Luster is dull to earthy; Structure is microcrystalline or clastic with naturally eroded holes; Cleavage is none; Specific gravity is typically 2.5 to 2.7.

Formation & geological history

Formed through mechanical and chemical weathering processes where softer mineral inclusions, fossils, or pockets within sedimentary rocks (like limestone or sandstone) are dissolved or eroded away by water action over hundreds to thousands of years, commonly in riverbeds, lakeshores, or marine environments.

Uses & applications

Primarily used as a talisman, amulet, or folk magic object (traditionally believed to ward off evil spirits, grant second sight, or protect against nightmares), and as unique decorative items or conversation pieces for rock and crystal collectors.

Geological facts

Hag stones are known by many names across different cultures, including adder stones, witch stones, hole stones, and serpent stones. Folklore dictates that looking through the natural hole allows the viewer to see through faerie glamour or hidden realms.

Field identification & locations

Easily identified by natural holes or perforations completely piercing through the stone, typically found along beaches, riverbanks, or creeks where tumbling action and water erosion have worn away softer interior parts. Collectors search specifically for smooth, water-worn stones with clean holes.

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