metamorphic
Weathered quartz-rich rock, likely iron-stained quartzite
Quartzite (predominantly SiO₂); identification is provisional from the image
AI-generated identification · may be incorrectTan to rusty brown with a pale gray-green patch and dull, rough surface; quartz has Mohs hardness 7 and a trigonal crystal structure, but grain size and cleavage cannot be determined visually here.
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Physical properties
Tan to rusty brown with a pale gray-green patch and dull, rough surface; quartz has Mohs hardness 7 and a trigonal crystal structure, but grain size and cleavage cannot be determined visually here.
Formation & geological history
Quartzite forms when quartz-rich sandstone is recrystallized by heat and pressure during metamorphism. Its age and exact formation environment cannot be determined from the photograph.
Uses & applications
Quartzite is used as building and landscaping stone, aggregate, and sometimes decorative stone; this small, weathered specimen has little commercial value.
Geological facts
Iron-oxide staining commonly produces rusty colors in quartz-rich rocks. The pictured specimen is too weathered and small to establish a definitive rock identification.
Field identification & locations
Look for interlocking quartz grains and a hard surface that resists scratching by a steel knife; quartzite commonly occurs in metamorphic mountain belts worldwide. A close-up of a fresh broken surface would help confirm it.
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