metamorphic
Yellow-green serpentinite pebble
Serpentinite; chiefly serpentine minerals (antigorite, lizardite, chrysotile), commonly with magnetite
AI-generated identification · may be incorrectUsually Mohs 2.5–4, pale green to yellow-green, waxy to dull luster, fine-grained and massive; cleavage is poor or indistinct. The rounded, water-worn surface and mottled coloration are consistent with a polished natural pebble.
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Physical properties
Usually Mohs 2.5–4, pale green to yellow-green, waxy to dull luster, fine-grained and massive; cleavage is poor or indistinct. The rounded, water-worn surface and mottled coloration are consistent with a polished natural pebble.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite are hydrated and metamorphosed during tectonic activity, commonly in ophiolites and subduction zones. Most examples are Paleozoic to Cenozoic, though serpentinite occurs in rocks of many ages.
Uses & applications
Used as decorative stone, carvings, lapidary material, aggregate, and occasionally architectural stone; attractive pieces may be sold as serpentine rather than high-value gemstone.
Geological facts
Serpentinite can contain magnetite and may weakly attract a magnet. Some varieties contain asbestos-form chrysotile, so avoid cutting or generating dust unless the material is tested and handled safely.
Field identification & locations
Look for low density, waxy feel, green-yellow mottling, softness, and occasional magnetism; common sources include California, Italy, New Zealand, Canada, and ophiolite belts worldwide. Exact identification from the photograph is provisional; jade and altered limestone are possible look-alikes.
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