metamorphic
Green serpentine
Serpentine-group minerals, chiefly lizardite and antigorite; approximate formula Mg₃Si₂O₅(OH)₄
AI-generated identification · may be incorrectTypically mottled green to yellow-green with a waxy or greasy luster, uneven fracture, and Mohs hardness of 2.5–4; usually massive rather than visibly crystalline. The specimen’s color and texture are consistent with serpentine, though the image alone cannot exclude nephrite or another green mineral.
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Physical properties
Typically mottled green to yellow-green with a waxy or greasy luster, uneven fracture, and Mohs hardness of 2.5–4; usually massive rather than visibly crystalline. The specimen’s color and texture are consistent with serpentine, though the image alone cannot exclude nephrite or another green mineral.
Formation & geological history
Forms when magnesium-rich ultramafic rocks such as peridotite undergo low-temperature hydration and metamorphism, commonly in ophiolite belts; formation ages vary from ancient Precambrian to modern tectonic zones.
Uses & applications
Used as ornamental stone, carvings, jewelry, countertops, and historically as a source of asbestos-group chrysotile; avoid cutting or sanding unknown material because fibrous varieties can be hazardous.
Geological facts
Serpentine is California’s state rock and commonly occurs with chromite, magnetite, talc, and magnesite. Its characteristic greasy feel and relatively low hardness help distinguish it from jade.
Field identification & locations
Common in California, New Zealand, Italy, Canada, and other convergent-plate settings; field tests include a waxy feel, green mottling, and easy scratching with a steel knife. Acid reaction is generally absent.
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