metamorphic
Small rounded green-gray pebble, likely greenstone
Greenstone (metamorphosed mafic rock; commonly chlorite- and epidote-bearing)
AI-generated identification · may be incorrectFine-grained, mottled green-gray, with a dull to slightly granular luster; individual crystals and cleavage are not visible. Likely Mohs hardness about 5–6, but the photo alone cannot confirm its exact mineralogy.
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Physical properties
Fine-grained, mottled green-gray, with a dull to slightly granular luster; individual crystals and cleavage are not visible. Likely Mohs hardness about 5–6, but the photo alone cannot confirm its exact mineralogy.
Formation & geological history
Greenstone forms when basalt or similar mafic rock is altered by low-grade metamorphism and fluids. Its age and specific origin cannot be determined from the image.
Uses & applications
Small pebbles are mainly kept as curiosities or used in crafts and landscaping; this specimen appears too small and uncharacterized for industrial use or fine jewelry.
Geological facts
The rounded shape suggests abrasion during transport or weathering, but it does not establish where the pebble originated.
Field identification & locations
A green color and fine-grained texture are consistent with greenstone, but confirmation requires closer examination or testing. Greenstones occur in metamorphic belts worldwide; a photo is insufficient to identify a locality.
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