mineral

Tumbled serpentine

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

AI-generated identification · may be incorrect

A polished/tumbled, mottled yellow-green and white specimen with waxy to vitreous luster. Serpentine hardness is about 2.5–4 Mohs, monoclinic or trigonal depending on polytype, with poor cleavage and specific gravity around 2.5–2.6; the white areas may be calcite or magnesite.

Identified September 13, 2026More mineral →

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Physical properties

Formation & geological history

Forms when olivine- and pyroxene-rich ultramafic rocks hydrate during hydrothermal alteration (serpentinization), commonly in oceanic crust and subduction zones. It can range from Precambrian to modern geological settings.

Uses & applications

Used as ornamental stone, carvings, cabochons, tumbled stones, and historically as a decorative building material; not generally valuable as fine jewelry due to low hardness.

Geological facts

The image most likely shows serpentine, though jade, prehnite, or heavily altered greenstone are possible without testing. Some serpentines contain fibrous chrysotile; avoid cutting or creating dust from unknown material.

Field identification & locations

Identify by its greasy/waxy feel, mottled green coloration, low hardness, and lack of obvious crystal faces; it can often be scratched by a steel blade. Common sources include California, Vermont, Italy, New Zealand, Afghanistan, and Canada.