metamorphic
Quartzite with Hag Stone Feature
Quartzite (SiO2)
AI-generated identification · may be incorrectHardness 7, brown/tan color due to iron oxides, sparkling luster from quartz grains, granular texture, conchoidal fracture.
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Physical properties
Hardness 7, brown/tan color due to iron oxides, sparkling luster from quartz grains, granular texture, conchoidal fracture.
Formation & geological history
Formed from quartz sandstone subjected to heat and pressure. Water erosion rounded the stone, and differential weathering likely created the hole.
Uses & applications
Often collected for decorative purposes or folklore (hag stones). Quartzite is also used in construction and as ballast.
Geological facts
A stone with a naturally occurring hole is often called a 'hag stone', 'adder stone', or 'fairy stone'. In folklore, they were believed to offer protection or allow one to see into the fairy realm.
Field identification & locations
Identify by its hardness (scratches glass), granular sugary texture under magnification, and lack of fizzing with acid. The natural hole makes it a notable find for collectors of curiosities.
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