sedimentary

Hag Stone

Perforated Quartz / Sedimentary Rock

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.

Identified August 1, 2026More sedimentary →

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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.