sedimentary
Hagstone (Adder Stone)
Chert or Sedimentary pebble with natural perforation
Hardness: 6.5-7 (Mohs); Color: Tan, brown, or buff; Luster: Dull to earthy; Composition: Primarily microcrystalline quartz (silica); Feature: Natural hole through the center.
- Hardness
- 6
- Color
- Tan, brown, or buff
- Luster
- Dull to earthy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Tan, brown, or buff; Luster: Dull to earthy; Composition: Primarily microcrystalline quartz (silica); Feature: Natural hole through the center.
Formation & geological history
Formed through the natural erosion of a sedimentary rock, where a softer part of the stone (like a fossil or softer mineral inclusion) is bored out by wave action, wind, or acidic water over thousands of years.
Uses & applications
Primarily collected as curiosities or used in folk magic and jewelry. Historically used as protective amulets.
Geological facts
Also called Witch Stones or Adder Stones, they were traditionally believed to allow the wearer to see through magical illusions or protect against the 'evil eye' and nightmares.
Field identification & locations
Identify in the field by looking for stones with naturally occurring, smooth-edged holes that penetrate all the way through. They are commonly found on beaches or in riverbeds where water erosion is high.
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