metamorphic
Likely serpentine or greenstone pebble
Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄; possibly chlorite-rich greenstone
AI-generated identification · may be incorrectRounded olive-green to gray-green, dull to waxy luster, fine-grained and massive; likely Mohs hardness 2.5–4, with no visible cleavage. Exact identification is limited by the blurred image and lack of tests.
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Physical properties
Rounded olive-green to gray-green, dull to waxy luster, fine-grained and massive; likely Mohs hardness 2.5–4, with no visible cleavage. Exact identification is limited by the blurred image and lack of tests.
Formation & geological history
Likely formed by low-temperature metamorphism or hydrothermal alteration of magnesium-rich ultramafic rock; serpentinization commonly occurred in ancient oceanic crust and ophiolite belts over millions to billions of years.
Uses & applications
Used decoratively as carved stone, ornamental aggregate, and occasionally in jewelry; historically, some asbestos-bearing serpentine was used industrially, though this presents a health hazard when dusty.
Geological facts
Serpentine often shows mottled green coloration and a smooth, greasy or waxy feel. It can resemble jade, but is generally softer and less dense.
Field identification & locations
Common in California, Vermont, Italy, New Zealand, and ultramafic terrains worldwide; test cautiously with a steel blade and avoid generating dust. A streak, hardness, specific-gravity, and asbestos assessment would improve identification.
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