metamorphic
Polished serpentine (likely bowenite/antigorite)
Serpentine-group minerals, chiefly antigorite Mg₃Si₂O₅(OH)₄; possibly bowenite (massive antigorite)
AI-generated identification · may be incorrectOlive-green to yellow-green, waxy to greasy luster, massive and smoothly polished with cloudy veining. Mohs hardness about 3–5.5 (often ~4); no obvious cleavage; specific gravity ~2.5–2.6. The rounded shape indicates tumbling or natural water wear.
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Physical properties
Olive-green to yellow-green, waxy to greasy luster, massive and smoothly polished with cloudy veining. Mohs hardness about 3–5.5 (often ~4); no obvious cleavage; specific gravity ~2.5–2.6. The rounded shape indicates tumbling or natural water wear.
Formation & geological history
Forms when ultramafic rocks such as peridotite undergo hydration and metamorphism, commonly in ophiolite belts. Serpentinite bodies occur in northern Iran, including the Alborz region near the reported location, though exact provenance cannot be confirmed from the image.
Uses & applications
Used as an ornamental and carving stone, cabochons, beads, and polished specimens; some serpentinite is used architecturally, though less commonly today because of weathering and possible asbestos-bearing varieties.
Geological facts
Its green color comes from iron-bearing serpentine minerals. It can resemble jade, but is generally softer; fibrous serpentinite may contain chrysotile asbestos, so avoid cutting, drilling, or generating dust.
Field identification & locations
Likely serpentine rather than jade: the waxy luster, mottled olive color, softness, and lack of visible granular crystals are characteristic. Confirm with hardness, streak, density, and ideally Raman/XRD testing; do not rely on color alone.
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