mineral

Tumbled serpentine (likely nephrite-like greenstone)

Serpentine-group minerals, chiefly antigorite/lizardite; exact identification requires testing

AI-generated identification · may be incorrect

Usually pale to dark green, waxy to vitreous luster, massive rather than visibly crystalline, Mohs hardness about 2.5–5.5, poor cleavage, and specific gravity roughly 2.5–2.6. The rounded, polished form is consistent with a tumbled stone.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Serpentine forms when ultramafic rocks such as peridotite undergo hydration and metamorphic alteration, commonly in ancient oceanic crust and subduction zones. The specimen’s geological age cannot be determined from the photograph.

Uses & applications

Used for ornamental carvings, beads, cabochons, decorative stone, and sometimes architectural facing. Softer varieties are popular inexpensive lapidary material.

Geological facts

Serpentine may show mottled green, yellow-green, or black veining and can resemble jade. Some serpentine rocks contain chrysotile asbestos, so avoid cutting, drilling, or generating dust unless composition is confirmed.

Field identification & locations

Common in California, Vermont, Italy, New Zealand, Canada, and Afghanistan. Field clues include low hardness, greasy or waxy feel, green mottling, and inability to scratch glass; jade is generally harder and tougher.