mineral
Tumbled green stone, likely serpentine
Serpentine-group minerals, commonly antigorite or lizardite; approximate formula Mg₃Si₂O₅(OH)₄
AI-generated identification · may be incorrectOlive-green, waxy to vitreous luster, opaque to slightly translucent, smoothly tumbled; Mohs hardness about 2.5–4, generally massive rather than visibly crystalline, with poor cleavage and specific gravity around 2.5–2.6.
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Physical properties
Olive-green, waxy to vitreous luster, opaque to slightly translucent, smoothly tumbled; Mohs hardness about 2.5–4, generally massive rather than visibly crystalline, with poor cleavage and specific gravity around 2.5–2.6.
Formation & geological history
Forms when magnesium-rich ultramafic rocks such as peridotite hydrate during hydrothermal alteration, commonly in ophiolites and subduction-zone settings; ages range from Precambrian to recent. The exact identification is uncertain from the photograph alone.
Uses & applications
Used for ornamental stone, carvings, beads, tumbled specimens, and occasionally tiles or decorative objects; softer pieces are unsuitable for heavy-wear jewelry.
Geological facts
Its olive color and waxy appearance are characteristic of serpentine, though similar-looking nephrite, green jasper, prehnite, or dyed materials are possible.
Field identification & locations
Look for low hardness, waxy feel, green streak or powder, and association with dark ultramafic rock; common localities include California, Italy, New Zealand, Canada, and Afghanistan. A hardness, streak, and specific-gravity test would improve identification.
