metamorphic
Veined river pebble (likely metamorphic rock)
Likely quartz-veined slate or phyllite; exact identification requires closer examination
AI-generated identification · may be incorrectRounded gray-green pebble with thin tan quartz or calcite veins and a fine-grained, foliated appearance. Likely hardness 3–7 depending on the host rock and vein minerals; dull to slightly silky luster, with no obvious large crystals.
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Physical properties
Rounded gray-green pebble with thin tan quartz or calcite veins and a fine-grained, foliated appearance. Likely hardness 3–7 depending on the host rock and vein minerals; dull to slightly silky luster, with no obvious large crystals.
Formation & geological history
The host rock was likely compacted and metamorphosed from fine sediment, then fractured and filled by mineral-rich fluids; stream transport rounded it. Its age and original geological setting cannot be determined from the image.
Uses & applications
Primarily a natural-history or decorative collectible; similar rocks may be used as landscaping or ornamental stone.
Geological facts
Contrasting veins commonly form when silica- or carbonate-rich fluids fill cracks in older rock.
Field identification & locations
Look for subtle planar layering or foliation in the gray host and harder, contrasting vein material; quartz veins resist scratching by a steel blade, while calcite fizzes in weak acid. Veined pebbles occur in river gravels worldwide.
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