metamorphic
Polished serpentine (likely bowenite)
Serpentinite; predominantly antigorite/lizardite Mg₃Si₂O₅(OH)₄, possibly with magnetite and carbonate
AI-generated identification · may be incorrectTypically olive-green to black with mottled or veined patterns and waxy-to-subvitreous luster; Mohs hardness 2.5–4, usually massive with no visible crystal structure, and specific gravity about 2.5–2.6.
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Physical properties
Typically olive-green to black with mottled or veined patterns and waxy-to-subvitreous luster; Mohs hardness 2.5–4, usually massive with no visible crystal structure, and specific gravity about 2.5–2.6.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite are hydrated during tectonic alteration, commonly in oceanic crust and subduction zones; ages range from Precambrian to modern tectonic settings.
Uses & applications
Polished serpentine is used for cabochons, beads, carvings, and ornamental stone; massive serpentinite has limited architectural and landscaping use.
Geological facts
The image appears to show a small tumbled or polished piece, but exact identification requires tests because similar green stones include nephrite, jasper, and chlorite-rich rocks.
Field identification & locations
Look for a greasy/waxy feel, low hardness, green-black mottling, and occasional magnetism from magnetite; common sources include California, New Zealand, Italy, Canada, and Afghanistan. Avoid acid or powder inhalation unless testing professionally.
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