metamorphic
Likely quartz-rich pebble (possibly weathered quartzite)
Quartzite; predominantly SiO₂ (identification tentative from photograph)
AI-generated identification · may be incorrectSmall rounded cream-gray specimen with dull to slightly waxy luster and probable granular texture; quartz hardness is about Mohs 7, with no obvious cleavage and white streak. The dark lines may be surface veining, fractures, or inclusions.
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Physical properties
Small rounded cream-gray specimen with dull to slightly waxy luster and probable granular texture; quartz hardness is about Mohs 7, with no obvious cleavage and white streak. The dark lines may be surface veining, fractures, or inclusions.
Formation & geological history
If quartzite, it formed when quartz-rich sandstone was metamorphosed under heat and pressure, typically during regional mountain building; its exact geological age cannot be determined visually. Rounding indicates later transport by water or sedimentary abrasion.
Uses & applications
Common quartzite is used as aggregate, building stone, paving, and decorative material; attractive pieces may be collected but this specimen has little commercial value.
Geological facts
Quartzite commonly breaks across grains rather than around them and resists scratching by a steel knife. A definitive identification requires a fresh surface, hardness testing, and examination with a hand lens.
Field identification & locations
Common in stream gravels and eroded mountain terrains worldwide, especially quartz-rich metamorphic belts. Test whether it scratches glass and inspect for fused quartz grains; do not rely on color alone.
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