sedimentary
Quartz-rich sandstone (probable)
Quartz arenite; predominantly quartz (SiO₂) grains
AI-generated identification · may be incorrectPale gray-green, dull and granular, with rounded edges; quartz hardness is 7 Mohs, but the rock’s hardness depends on cement and grain cohesion. Individual grains appear fine, though the exact composition cannot be confirmed from the image.
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Physical properties
Pale gray-green, dull and granular, with rounded edges; quartz hardness is 7 Mohs, but the rock’s hardness depends on cement and grain cohesion. Individual grains appear fine, though the exact composition cannot be confirmed from the image.
Formation & geological history
Likely formed as sand deposited and cemented into rock; its age and depositional setting cannot be determined from appearance alone.
Uses & applications
Common sandstone is used as building and paving stone, aggregate, and decorative stone; this small, ordinary piece has little commercial value.
Geological facts
The specimen’s pale, sparkly surface is consistent with quartz-rich sandstone, but a close-up or simple grain and hardness tests would improve identification.
Field identification & locations
Look for visible sand-sized grains and a gritty texture; sandstone is widespread in sedimentary basins worldwide. Similar-looking quartzite or other rocks may require testing to distinguish.
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