metamorphic
Rounded pale beach stone (likely quartzite)
Quartzite, composed predominantly of quartz (SiO₂)
AI-generated identification · may be incorrectFine-grained, off-white to light gray, with a matte, slightly granular surface; quartz has Mohs hardness 7, vitreous luster when freshly broken, and no cleavage. Its rounded shape and smooth surface are consistent with water-worn abrasion.
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Physical properties
Fine-grained, off-white to light gray, with a matte, slightly granular surface; quartz has Mohs hardness 7, vitreous luster when freshly broken, and no cleavage. Its rounded shape and smooth surface are consistent with water-worn abrasion.
Formation & geological history
Likely formed when quartz-rich sandstone was recrystallized under heat and pressure, then rounded through prolonged transport in water. Quartzites occur in rocks of many ages; the image alone cannot establish this stone’s age or exact origin.
Uses & applications
Small rounded stones are used for decoration, landscaping, crafts, and collecting; quartzite is also quarried as aggregate and building stone.
Geological facts
Quartzite is generally harder and more resistant to weathering than its sandstone precursor.
Field identification & locations
A likely quartzite can be tested by its hardness: it should scratch glass, while a fresh break may show interlocking quartz grains. Similar pale beach stones can also be other rocks, so visual identification is not definitive.
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