sedimentary
Fine-grained sandstone (tentative)
Quartz-rich sandstone; exact composition cannot be confirmed from the photograph
AI-generated identification · may be incorrectA flat, rounded gray-brown specimen with a dull, granular-looking surface. Sandstone is commonly Mohs 6–7 if quartz-rich, with quartz grains in a finer cementing matrix; grain size and cleavage are not clearly visible here.
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Physical properties
A flat, rounded gray-brown specimen with a dull, granular-looking surface. Sandstone is commonly Mohs 6–7 if quartz-rich, with quartz grains in a finer cementing matrix; grain size and cleavage are not clearly visible here.
Formation & geological history
Sandstone forms when sand is compacted and cemented, often in river, beach, desert, or shallow-marine settings. Its age cannot be determined from the image.
Uses & applications
Sandstone is used as building and paving stone, aggregate, and decorative material; this small rounded piece is mainly suited to collecting or display.
Geological facts
Sandstone composition and properties vary widely with grain type and cement, so visual identification alone is uncertain.
Field identification & locations
Look for visible sand-sized grains and a gritty texture; a scratch test or magnification can help distinguish it from other fine-grained rocks. The specimen’s locality is unknown.
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