metamorphic
Tumbled quartzite pebble
Quartzite, predominantly quartz (SiO₂)
AI-generated identification · may be incorrectHardness about 7 Mohs; pale tan to cream, opaque, with a dull to subtly vitreous luster and fine-grained massive texture. The rounded shape indicates natural water wear or tumbling; no visible cleavage, with conchoidal to irregular fracture.
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Physical properties
Hardness about 7 Mohs; pale tan to cream, opaque, with a dull to subtly vitreous luster and fine-grained massive texture. The rounded shape indicates natural water wear or tumbling; no visible cleavage, with conchoidal to irregular fracture.
Formation & geological history
Formed when quartz-rich sandstone was recrystallized under heat and pressure, commonly during regional metamorphism; its exact geological age cannot be determined from the photograph. The surface appears naturally weathered or possibly lightly polished.
Uses & applications
Used as aggregate, paving and building stone, landscaping material, and decorative or tumbled specimens; this ordinary piece has little jewelry value.
Geological facts
Quartzite is tougher and generally more resistant to weathering than its sandstone precursor. It can resemble marble, but quartzite is harder and does not fizz with dilute hydrochloric acid.
Field identification & locations
Common in metamorphic mountain belts and river gravels worldwide. A steel file should not scratch it; a glass plate may be scratched, though a surface coating or rounded weathering can affect testing.
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