metamorphic

Polished serpentine pebble

Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, or chrysotile)

AI-generated identification · may be incorrect

Typically Mohs 2.5–4, green to yellow-green with mottling, waxy-to-greasy luster, and a massive, noncrystalline texture; the specimen appears polished and may contain pale carbonate or other mineral patches.

Identified September 4, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when ultramafic mantle rocks such as peridotite undergo hydrothermal alteration and hydration, commonly along tectonic plate boundaries; ages vary from Precambrian to modern geological settings.

Uses & applications

Used as an ornamental and carving stone, jewelry bead material, and architectural stone; softer pieces are mainly collectible or decorative.

Geological facts

Serpentinite’s green coloration resembles serpentine skin, inspiring its name. Some varieties may contain chrysotile asbestos, so avoid cutting, drilling, or generating dust unless its composition is verified.

Field identification & locations

Identify by its low hardness, smooth waxy polish, green mottled appearance, and ability to scratch with a steel knife; common sources include California, Italy, New Zealand, Canada, and the Alps. Exact identification from the photo is tentative because similar polished greenstones are possible.