metamorphic
Weathered quartz-rich metamorphic rock (probable quartzite or quartz vein rock)
Quartz-dominant rock; chiefly SiO₂, with minor iron-oxide and mica/clay impurities
AI-generated identification · may be incorrectTypically Mohs 7, white to gray with rusty brown staining, vitreous to dull luster, and massive granular texture; no obvious cleavage. The specimen appears heavily weathered and fractured, with possible cavities or altered inclusions.
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Physical properties
Typically Mohs 7, white to gray with rusty brown staining, vitreous to dull luster, and massive granular texture; no obvious cleavage. The specimen appears heavily weathered and fractured, with possible cavities or altered inclusions.
Formation & geological history
Likely formed when quartz-rich sandstone recrystallized under heat and pressure, or represents a deformed quartz vein; the exact age and setting cannot be determined from the photograph. Brown coloration is probably limonite/hematite weathering.
Uses & applications
Used as aggregate, decorative stone, landscaping rock, and occasionally lapidary material; attractive pieces may be polished, though this specimen appears mainly collectible.
Geological facts
Quartzite commonly resists weathering more strongly than surrounding rocks, producing ridges and durable loose cobbles.
Field identification & locations
Test for hardness: it should scratch ordinary glass but not be scratched by a steel knife; a fresh break should reveal sugary quartz grains. Common in metamorphic mountain belts and quartz-vein zones.
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