metamorphic
Greenstone pebble, likely serpentine or epidote-bearing rock
Probable serpentinite (serpentine-group minerals: Mg₃Si₂O₅(OH)₄), possibly epidote-rich metamorphic rock
AI-generated identification · may be incorrectSmall, opaque green specimen with a dull-to-waxy luster and granular, irregular texture. Likely Mohs 2.5–6 depending on composition; crystal structure is fine-grained and cleavage is not readily visible.
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Physical properties
Small, opaque green specimen with a dull-to-waxy luster and granular, irregular texture. Likely Mohs 2.5–6 depending on composition; crystal structure is fine-grained and cleavage is not readily visible.
Formation & geological history
Probably formed by low- to moderate-temperature metamorphism or hydrothermal alteration of ultramafic rock, commonly during seafloor or mountain-building processes; age cannot be determined from the image.
Uses & applications
Used as decorative stone, carvings, and collector material; some greenstones are occasionally cut as cabochons, but this piece appears mainly suitable as a specimen.
Geological facts
Green color may result from serpentine, chlorite, epidote, or actinolite, so a precise identification requires hardness, streak, specific gravity, and possibly spectroscopy.
Field identification & locations
Common in ophiolite belts and metamorphic terrains, including California, Vermont, New Zealand, Italy, and the Urals. Field clues include green color, relatively low density, waxy surface, and possible white veining; avoid dust from unknown fibrous serpentinite.
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