igneous
Rounded quartz-rich pebble
Likely quartzite (recrystallized quartz, SiO₂); visual identification is uncertain
AI-generated identification · may be incorrectTan to buff, dull-to-glassy granular surface, with no obvious cleavage; quartz has Mohs hardness 7 and a hexagonal crystal structure. The rounded shape and weathered surface obscure its original texture.
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Physical properties
Tan to buff, dull-to-glassy granular surface, with no obvious cleavage; quartz has Mohs hardness 7 and a hexagonal crystal structure. The rounded shape and weathered surface obscure its original texture.
Formation & geological history
If quartzite, it formed when quartz-rich sandstone was recrystallized by heat and pressure during metamorphism; its age and source cannot be determined from the image.
Uses & applications
Commonly collected as a pebble or used decoratively in landscaping; high-quality quartzite is also used for building stone and countertops.
Geological facts
Quartzite is often mistaken for quartz-rich sandstone; unlike sandstone, it typically breaks across fused quartz grains rather than around them.
Field identification & locations
The specimen appears to be a naturally rounded geological pebble. Quartzite occurs worldwide, especially in mountain belts; a hardness or acid test and a fresh broken surface would help confirm identification.
