metamorphic

Tumbled green stone, likely serpentine

Serpentine-group minerals, chiefly antigorite/lizardite; approximate formula Mg₃Si₂O₅(OH)₄

AI-generated identification · may be incorrect

Pale green, mottled, and opaque to slightly translucent with a waxy luster; typically Mohs hardness 2.5–4, fine-grained and massive, with no obvious cleavage. The rounded shape indicates tumbling or natural abrasion.

Identified September 16, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when ultramafic mantle rocks such as peridotite undergo low-temperature hydrothermal alteration, commonly during oceanic crust formation or mountain-building; ages vary widely. Commonly associated with asbestos-bearing serpentinite.

Uses & applications

Used as a carving and ornamental stone, beads, cabochons, tiles, and decorative objects; historically used for green architectural stone. Avoid cutting or grinding unknown serpentinite because some varieties contain asbestos-form minerals.

Geological facts

Serpentine is a mineral group rather than one single mineral, and its green color comes from iron and nickel substitutions. The specimen could also be green aventurine, nephrite, or prehnite, which cannot be distinguished confidently from this image alone.

Field identification & locations

Look for a very soft, smooth, waxy green surface and mottled veining; a steel nail may scratch it. Common localities include California, New Zealand, Italy, Canada, and the Ural Mountains.