mineral

Green tumbled stone, likely serpentine

Serpentine-group mineral, commonly antigorite or lizardite; identification is uncertain from the image

AI-generated identification · may be incorrect

Opaque pale gray-green, waxy to dull luster, smoothly tumbled, with no visible crystal faces or cleavage. Serpentine hardness is about 2.5–4 Mohs and specific gravity about 2.5–2.6.

Identified September 16, 2026More mineral →

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Physical properties

Opaque pale gray-green, waxy to dull luster, smoothly tumbled, with no visible crystal faces or cleavage. Serpentine hardness is about 2.5–4 Mohs and specific gravity about 2.5–2.6.

Formation & geological history

Forms mainly by hydrothermal alteration of ultramafic rocks such as peridotite, commonly in ophiolite belts; its age depends on the host formation. The rounded shape indicates human tumbling and polishing.

Uses & applications

Used as a decorative stone, carving material, ornamental aggregate, and inexpensive lapidary specimen; it is not generally a jewelry gemstone of high value.

Geological facts

The green color comes largely from iron and nickel-bearing serpentine minerals. Some serpentinite can contain chrysotile asbestos, so avoid cutting, drilling, or generating dust unless its composition is tested.

Field identification & locations

Likely serpentine if it feels relatively soft, has a greasy/waxy surface, and may show mottled green veining; common sources include California, Italy, New Zealand, and China. A hardness, streak, density, and laboratory test would be needed for confirmation.