metamorphic

Tumbled serpentine (likely greenstone)

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

AI-generated identification · may be incorrect

Typically pale to dark green, waxy to greasy luster, massive rather than visibly crystalline, with Mohs hardness about 2.5–4 and no prominent cleavage. The rounded shape indicates tumbling or natural abrasion; identification from the image is approximate.

Identified September 16, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when magnesium-rich ultramafic rocks such as peridotite undergo hydrothermal metamorphism, commonly in ophiolite belts and subduction zones. Serpentinization ranges from ancient Precambrian occurrences to active modern seafloor systems.

Uses & applications

Used as ornamental stone, carvings, beads, countertops, and decorative aggregate; historically used for “greenstone” objects. Serpentine is generally inexpensive unless unusually patterned or from a notable locality.

Geological facts

Often resembles jade, but is usually softer and less tough; some varieties may contain chrysotile asbestos, so avoid cutting, drilling, or generating dust unless composition is confirmed.

Field identification & locations

Look for mottled green color, waxy feel, low hardness, and possible black magnetite specks; a steel blade may scratch it, unlike jade. Common sources include California, New Zealand, Italy, Canada, Russia, and many ophiolite complexes.