sedimentary

Hag Stone

Perforated Sedimentary Rock (typically Limestone or Sandstone)

AI-generated identification · may be incorrect

Hardness: 3-7 (depending on mineral composition); Color: Light grey, tan, or beige; Luster: Dull/Earthy; Structure: Clastic or Biogenic; Cleavage: None; Key feature: A naturally occurring hole formed by erosion.

Hardness: 3-7 (depending on mineral composition)
Color: Light grey, tan, or beige
Luster: Dull/Earthy

Identified April 19, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through 'boring' by marine organisms (like Piddock clams) or water erosion over many years in coastal or river environments. The base material is typically an ancient sedimentary stone formed in shallow seas.

Uses & applications

Primarily used as amulets, talismans in folk magic, and for jewelry making. In the past, they were used as protective charms for livestock and homes.

Geological facts

Also known as Odin stones, Fairy stones, or Holy stones. In European folklore, it was believed that looking through the hole would allow a person to see into the spirit realm or see 'invisible' fairies.

Field identification & locations

Identify in the field by looking for smooth beach pebbles with a hole that passes entirely through. Often found on pebbly beaches specifically once the tide has receded.