sedimentary
Hag Stone
Perforated Sedimentary Rock (typically Sandstone or Siltstone)
Hardness: 6-7 (if silica-rich), Color: Tan, brown, or earthy ochre, Luster: Dull/Earthy, Texture: Pitted and porous (vesicular/vuggy), Feature: Naturally occurring hole passing through the specimen.
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Physical properties
Hardness: 6-7 (if silica-rich), Color: Tan, brown, or earthy ochre, Luster: Dull/Earthy, Texture: Pitted and porous (vesicular/vuggy), Feature: Naturally occurring hole passing through the specimen.
Formation & geological history
Formed through mechanical and chemical weathering where softer inclusions (like fossils, shells, or calcite nodules) are eroded out of a harder host rock by wave action or acidic water over thousands of years.
Uses & applications
Primarily used as a lucky charm, protective talisman, or decorative garden stone. Historically used in folklore to ward off nightmares or evil spirits.
Geological facts
Also known as Odin stones, fairy stones, or adder stones. One of the oldest known types of amulets across various cultures, believed to allow the wearer to see into the fairy realm if they look through the hole.
Field identification & locations
Look for stones with a clean, naturally bored hole in riverbeds or coastal shores. They are commonly found in the UK, Northern Europe, and coastal North America. The hole should show signs of natural wear rather than drilling marks.
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