metamorphic
Polished serpentine pebble
Serpentinite, chiefly antigorite/lizardite Mg₃Si₂O₅(OH)₄
AI-generated identification · may be incorrectDark olive-gray, waxy to slightly glossy luster with mottled fibrous texture; typically Mohs 2.5–4, nonfoliated to weakly foliated, with no obvious cleavage. The rounded shape and sheen indicate natural abrasion or polishing.
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Physical properties
Dark olive-gray, waxy to slightly glossy luster with mottled fibrous texture; typically Mohs 2.5–4, nonfoliated to weakly foliated, with no obvious cleavage. The rounded shape and sheen indicate natural abrasion or polishing.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite hydrate and metamorphose near tectonic plate boundaries; most examples are Paleozoic or younger, depending on the host terrane.
Uses & applications
Used as ornamental stone, carvings, beads, countertops, and decorative objects; attractive pieces have modest lapidary value.
Geological facts
Serpentinite is named for its often snake-skin-like pattern. Some varieties may contain chrysotile asbestos, so avoid cutting or generating dust unless tested and handled properly.
Field identification & locations
Identify by its low hardness, greasy/waxy feel, green-gray color, and inability to scratch glass reliably; common in ophiolites and subduction-zone rocks worldwide, including California, Italy, New Zealand, and Canada.
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