metamorphic

Green-and-black serpentine-rich rock

Serpentinite, likely with magnetite and chlorite/pyroxene

AI-generated identification · may be incorrect

Soft to moderately hard (about Mohs 2.5–4); mottled pale green, black, and white with a waxy to dull luster. Typically massive and nonfoliated, with no obvious cleavage; density commonly 2.5–2.7 g/cm³.

Identified September 16, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when ultramafic mantle rocks such as peridotite were hydrothermally altered to serpentine minerals, commonly during seafloor metamorphism or subduction. The exact age cannot be determined from the photograph.

Uses & applications

Used as decorative stone, carvings, countertops, and lapidary material; historically used for ornamental objects. Collecting value is usually modest unless unusually patterned or from a notable locality.

Geological facts

The green color comes mainly from serpentine-group minerals, while black patches may be magnetite, chromite, or residual pyroxene. Serpentinite can contain trace chrysotile asbestos, so avoid cutting, drilling, or generating dust without proper testing and controls.

Field identification & locations

Common in ophiolites and tectonic belts, including California, Italy, New Zealand, Canada, and the Appalachians. Field clues include green color, waxy texture, low hardness, and possible magnetism; visual identification is approximate.