metamorphic
Weathered metamorphic pebble, likely greenstone
Probable greenschist or chlorite-rich metabasalt; exact identification requires testing
AI-generated identification · may be incorrectFine-grained, rounded, dull earthy green-brown surface with weak foliation or banding and no visible crystals. Estimated hardness 5–6 Mohs; opaque, low luster, and likely moderate-to-high specific gravity.
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Physical properties
Fine-grained, rounded, dull earthy green-brown surface with weak foliation or banding and no visible crystals. Estimated hardness 5–6 Mohs; opaque, low luster, and likely moderate-to-high specific gravity.
Formation & geological history
Likely basaltic volcanic rock metamorphosed under greenschist-facies conditions, then rounded by river or beach transport and weathering. Commonly Paleozoic or Precambrian, though age cannot be determined visually.
Uses & applications
Typically used as landscape stone, aggregate, or a teaching and collecting specimen; it has little jewelry value unless polished and attractively patterned.
Geological facts
The green color commonly comes from chlorite, epidote, actinolite, or other metamorphic minerals replacing basalt. Surface weathering can obscure the original foliation and mineral texture.
Field identification & locations
Look for green-gray color, fine grain, toughness, and faint planar fabric; a streak, hardness, acid, magnetism, and thin-section tests would refine identification. Common in metamorphic belts and glacial or stream gravels.
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