metamorphic

Polished green tumbled stone, likely serpentine

Serpentinite (rock composed chiefly of serpentine-group minerals, approximately Mg₃Si₂O₅(OH)₄)

AI-generated identification · may be incorrect

Small, rounded, opaque olive-green specimen with a smooth polish and subdued waxy luster. Serpentine minerals have Mohs hardness about 2.5–5.5; the image alone does not confirm the identification or specific gravity.

Identified October 5, 2026More metamorphic →

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Physical properties

Formation & geological history

Serpentinite forms when water alters magnesium-rich rocks, commonly at oceanic crust and mantle settings; its age varies with the host rocks and alteration. The specimen has been shaped and polished, obscuring diagnostic natural texture.

Uses & applications

Tumbled serpentinite is used for decoration, lapidary crafts, and inexpensive jewelry; larger serpentinite deposits are also quarried as ornamental stone.

Geological facts

Serpentine is a mineral group rather than one single mineral, and serpentinite can contain several serpentine minerals.

Field identification & locations

The olive color and waxy polish are consistent with serpentinite, but other green stones can look similar; hardness, streak, and mineral tests would help distinguish them. Serpentinite occurs in many mountain belts and former oceanic crust zones worldwide.