metamorphic
Likely quartzite pebble
Quartz-rich quartzite, composed mainly of SiO₂
AI-generated identification · may be incorrectTan-brown, rounded, and somewhat glossy from wear; quartzite is typically Mohs 7, with a granular crystalline texture and no prominent cleavage. The image alone does not allow a confident identification.
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Physical properties
Tan-brown, rounded, and somewhat glossy from wear; quartzite is typically Mohs 7, with a granular crystalline texture and no prominent cleavage. The image alone does not allow a confident identification.
Formation & geological history
Forms when quartz-rich sandstone is recrystallized under heat and pressure, commonly during regional metamorphism; its age depends on the source formation.
Uses & applications
Quartzite is used as crushed aggregate, paving and building stone, and sometimes as a decorative or lapidary material.
Geological facts
Quartz grains in well-recrystallized quartzite are tightly interlocked, making it resistant to abrasion and often harder to break than its original sandstone.
Field identification & locations
The specimen appears to be a naturally rounded stone, but its smooth surface and lighting obscure diagnostic grain texture. A hardness or fresh-break test would help distinguish quartzite from other common pebbles.
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