metamorphic
Polished pink quartzite or jasper
Quartzite, predominantly SiO₂; possibly iron-stained jasper/chalcedony
AI-generated identification · may be incorrectHardness about 6.5–7 Mohs; salmon-pink, cream, and reddish-brown coloration with a glassy-to-waxy polish and no visible cleavage. The rounded, wet-looking surface is consistent with a tumbled specimen; exact identification requires a scratch or translucency test.
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Physical properties
Hardness about 6.5–7 Mohs; salmon-pink, cream, and reddish-brown coloration with a glassy-to-waxy polish and no visible cleavage. The rounded, wet-looking surface is consistent with a tumbled specimen; exact identification requires a scratch or translucency test.
Formation & geological history
Quartzite forms when quartz-rich sandstone is recrystallized under heat and pressure, commonly during Precambrian mountain-building; red tones result from iron oxides. If more microcrystalline and opaque, it may instead be jasper, a silica-rich sedimentary variety.
Uses & applications
Used as a decorative stone, tumbled collectible, cabochon material, and occasionally for countertops or facing stone. Common specimens have modest value.
Geological facts
The pale streaks may reflect quartz-rich bands or brecciated/re cemented zones. It should scratch glass but should not be scratched by a steel knife.
Field identification & locations
Common in metamorphic terrains and gravel deposits worldwide, including Brazil, India, Madagascar, and the western United States. A glass-scratch test and close inspection for granular quartz texture help distinguish quartzite from softer calcite-based stones.
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