metamorphic

Tumbled green serpentine (probable)

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

AI-generated identification · may be incorrect

Pale green with dark mottling, waxy-to-dull luster, and rounded tumbled surfaces; Mohs hardness about 2.5–4, typically massive with no obvious crystals. Specific gravity is approximately 2.5–2.6; the image alone cannot confirm composition.

Identified September 12, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when ultramafic rocks such as peridotite undergo hydration and metamorphic alteration, commonly in oceanic crust and subduction zones. Serpentinization ranges from ancient Precambrian settings to modern tectonic belts.

Uses & applications

Used as a decorative carving and lapidary stone, for beads, cabochons, and tumbled specimens; massive serpentine has also been used historically as ornamental building stone. Value is generally modest.

Geological facts

Serpentine is a mineral group rather than one single mineral, and some varieties may contain associated chrysotile asbestos; do not saw, sand, or drill unknown material without proper dust controls.

Field identification & locations

Common localities include California, Vermont, Italy, New Zealand, Canada, and Afghanistan. Identification clues are low hardness, green color, waxy feel, and possible dark magnetite veining; a hardness, streak, and specific-gravity test would help distinguish it from nephrite, aventurine, or dyed stone.