mineral

Tumbled serpentine

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

AI-generated identification · may be incorrect

Light green to yellow-green, waxy to greasy luster, opaque, and smoothly tumbled; Mohs hardness 2.5–5.5, usually massive rather than visibly crystalline, with uneven fracture and specific gravity about 2.5–2.6.

Identified September 21, 2026More mineral →

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Physical properties

Formation & geological history

Forms when ultramafic mantle rocks such as peridotite undergo low-temperature hydration (serpentinization), commonly in ancient oceanic crust and subduction zones; specimens may range from Precambrian to modern geological settings.

Uses & applications

Used as a decorative stone, carvings, beads, and inexpensive cabochons; serpentine rock has also been used historically for architectural ornament, though fibrous chrysotile varieties require asbestos precautions.

Geological facts

The bright green color comes from iron and nickel-bearing serpentine minerals; it is often confused with jade, but is generally softer and less tough.

Field identification & locations

Identify by its unusually low hardness, waxy feel, green mottling, and resistance to dilute acid; common sources include California, Italy, New Zealand, Canada, and Afghanistan. A small polished/tumbled piece is typically worth $2–$15 USD.