metamorphic

Tumbled serpentine

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

AI-generated identification · may be incorrect

Pale green to gray-green, mottled and waxy with a dull-to-greasy luster; typically Mohs 2.5–4, cryptocrystalline, with no obvious cleavage. The rounded shape indicates natural abrasion or tumbling.

Identified September 15, 2026More metamorphic →

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Physical properties

Pale green to gray-green, mottled and waxy with a dull-to-greasy luster; typically Mohs 2.5–4, cryptocrystalline, with no obvious cleavage. The rounded shape indicates natural abrasion or tumbling.

Formation & geological history

Forms when magnesium-rich ultramafic rocks such as peridotite undergo low-temperature hydration and alteration; common in serpentinite bodies, generally formed during ancient tectonic and metamorphic events.

Uses & applications

Used as a decorative carving and ornamental stone, sometimes as a low-cost cabochon or collectible; massive serpentine has limited construction use.

Geological facts

Serpentine is a mineral group rather than one single mineral, and its patterns can resemble jade. Some serpentinite may contain chrysotile asbestos, so avoid drilling, sawing, or generating dust without testing and appropriate protection.

Field identification & locations

Identify by its green mottling, relatively low hardness, waxy feel, and ability to scratch with a steel knife; jade is generally harder and tougher. Common in California, Vermont, Italy, New Zealand, and other former oceanic-plate regions.