metamorphic
Weathered quartz-rich pebble (tentative)
Likely quartzite; mineral composition predominantly quartz (SiO₂)
AI-generated identification · may be incorrectTan, cream, and rusty-brown mottling with a dull, weathered surface; quartz has Mohs hardness 7 and a trigonal crystal structure, but the specimen’s texture and cleavage cannot be confirmed from the image.
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Physical properties
Tan, cream, and rusty-brown mottling with a dull, weathered surface; quartz has Mohs hardness 7 and a trigonal crystal structure, but the specimen’s texture and cleavage cannot be confirmed from the image.
Formation & geological history
If quartzite, it formed when quartz-rich sandstone was compacted and recrystallized during metamorphism; its age and exact origin cannot be determined from the image.
Uses & applications
Quartzite is used as dimension stone, aggregate, and decorative stone; this small, unverified pebble is mainly suitable for collecting.
Geological facts
Quartzite commonly breaks across interlocking quartz grains rather than around them, giving fractures a granular or sugary appearance.
Field identification & locations
The image shows a single elongated, rounded specimen on weathered wood; test hardness and inspect a fresh break to distinguish quartzite from other pale rocks. Quartzite occurs worldwide in metamorphic terrains.
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