mineral

Yellow-green serpentine (likely)

Serpentine-group phyllosilicate, commonly lizardite or antigorite; approximate formula Mg₃Si₂O₅(OH)₄

AI-generated identification · may be incorrect

Pale yellow-green, waxy to greasy luster, opaque to translucent, uneven fracture, and weak cleavage; Mohs hardness 2.5–4, typically with a compact or fibrous texture. The image alone cannot confirm identity; similar-looking material includes chrysoprase, prehnite, or plastic/glass imitation.

Identified September 7, 2026More mineral →

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Physical properties

Formation & geological history

Forms when magnesium-rich ultramafic rocks such as peridotite undergo low-temperature hydrothermal alteration, commonly during oceanic crust formation and mountain-building; specimens may be geologically ancient. It is a mineral rather than an igneous, sedimentary, or metamorphic rock classification.

Uses & applications

Used as ornamental stone, carvings, beads, and minor architectural material; historically mistaken for or marketed as jade. Common material has modest value, while attractive translucent carved pieces may sell for roughly $5–$50.

Geological facts

Serpentine is the state rock of California and occurs in several polymorphs, including antigorite, lizardite, and chrysotile. Some serpentinite-associated material may contain asbestos-form minerals, so avoid cutting or creating dust.

Field identification & locations

Common in serpentinite belts and ophiolites worldwide, including California, Italy, New Zealand, Canada, and the Himalaya. Check its low hardness, waxy feel, green streak or powder, and lack of glassy conchoidal fracture; definitive identification requires microscopy or X-ray analysis.