metamorphic
Likely serpentine or serpentine-rich stone
Serpentine-group minerals, chiefly antigorite/lizardite; approximate formula Mg₃Si₂O₅(OH)₄
AI-generated identification · may be incorrectSmall irregular green specimen with mottled olive and yellow-green areas, dull to waxy luster, and no obvious crystal faces. Serpentine hardness is about 2.5–4 Mohs; specific gravity is typically 2.5–2.6, with indistinct cleavage and commonly massive texture.
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Physical properties
Small irregular green specimen with mottled olive and yellow-green areas, dull to waxy luster, and no obvious crystal faces. Serpentine hardness is about 2.5–4 Mohs; specific gravity is typically 2.5–2.6, with indistinct cleavage and commonly massive texture.
Formation & geological history
Forms when ultramafic rocks such as peridotite undergo hydration and low-temperature metamorphism, often in ancient oceanic crust and subduction zones. The image cannot establish a precise geological age.
Uses & applications
Used as ornamental and carving stone, countertops, beads, and teaching specimens; softer pieces may be polished or tumbled. Avoid generating dust, since some serpentine deposits can contain asbestos-form minerals.
Geological facts
The green color comes from iron and nickel-bearing serpentine minerals; yellow-green mottling may reflect olivine, magnetite, or weathering products. Similar-looking rocks include nephrite, chlorite-rich rock, and heavily altered basalt.
Field identification & locations
Common in California, Italy, Canada, New Zealand, and parts of the Appalachians and Alps. Confirm with hardness, waxy feel, low density, and a streak test; visual identification alone is tentative.
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