sedimentary
Hag Stone
Perforated Quartz / Sedimentary Rock
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, colors ranging from tan, brown, to white, vitreous to dull luster, cryptocrystalline or microcrystalline structure, conchoidal fracture, specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, colors ranging from tan, brown, to white, vitreous to dull luster, cryptocrystalline or microcrystalline structure, conchoidal fracture, specific gravity around 2.65.
Formation & geological history
Formed through natural weathering, erosion, and acidic groundwater dissolution or wave action carving out softer inclusions or fossils within sedimentary or quartz-rich rocks over thousands to millions of years.
Uses & applications
Historically used as a protective talisman or amulet in folklore to ward off evil spirits, witches, and nightmares, and currently collected as a novelty or lapidary curiosity.
Geological facts
Also known as an adder stone, witch stone, or holy stone, these stones have a naturally occurring hole entirely through them and are steeped in maritime and magical folklore.
Field identification & locations
Found along rivers, streams, and beaches where continuous water action erodes specific weak spots in pebbles. Easily identified by the distinct natural hole bored straight through the stone.
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