metamorphic
Rounded pink quartzite pebble
Quartzite; predominantly microcrystalline quartz (SiO₂), with minor iron-oxide staining and possibly feldspar or mica
AI-generated identification · may be incorrectTypically Mohs hardness 7, white to pink or reddish, with a vitreous to sugary luster and interlocking quartz grains; usually massive and lacks distinct cleavage. The specimen appears water-rounded and weathered.
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Physical properties
Typically Mohs hardness 7, white to pink or reddish, with a vitreous to sugary luster and interlocking quartz grains; usually massive and lacks distinct cleavage. The specimen appears water-rounded and weathered.
Formation & geological history
Formed when quartz-rich sandstone was recrystallized under heat and pressure during metamorphism; individual quartzite bodies may range from Precambrian to younger ages. The rounded shape indicates transport by stream, beach, or glacial action.
Uses & applications
Used as crushed stone, aggregate, paving and building material, and occasionally as a decorative stone; attractive pink pieces are collected but are generally not gemstone grade.
Geological facts
Quartzite is harder and more resistant to weathering than its sandstone precursor. A fresh broken surface commonly shows grains fused across former grain boundaries rather than loose sand.
Field identification & locations
Look for a quartz-rich, very hard pebble that scratches glass and does not fizz with dilute hydrochloric acid; sandstone commonly breaks around grains, while quartzite fractures through them. Common in quartz-rich mountain belts and derived river or beach gravels.
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