metamorphic
Serpentine (likely bowenite)
Serpentine-group minerals, chiefly antigorite and lizardite; often with magnetite and carbonate
AI-generated identification · may be incorrectTypically olive-green to yellow-green with black veining or mottling, waxy to subvitreous luster, and a smooth polished surface. Hardness is about 2.5–4 Mohs; massive rather than visibly crystalline, with poor cleavage and specific gravity around 2.5–2.6.
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Physical properties
Typically olive-green to yellow-green with black veining or mottling, waxy to subvitreous luster, and a smooth polished surface. Hardness is about 2.5–4 Mohs; massive rather than visibly crystalline, with poor cleavage and specific gravity around 2.5–2.6.
Formation & geological history
Forms when ultramafic rocks such as peridotite are hydrated and metamorphosed, commonly in oceanic crust and subduction-zone mélanges. Serpentinization spans many geological ages, from Precambrian terrains to modern seafloor systems.
Uses & applications
Used as ornamental stone, carvings, beads, cabochons, and polished specimens; historically used for building stone. Fibrous asbestos-bearing varieties require health precautions and are unsuitable for casual cutting.
Geological facts
The specimen’s green, mottled, polished appearance is characteristic of serpentine, though exact identification requires testing. Bowenite is a harder, translucent, gem-quality serpentine variety.
Field identification & locations
Common in serpentinite bodies and ophiolites, including California, Vermont, New Zealand, Italy, and Afghanistan. Confirm with low hardness, waxy feel, green streak or powder, and absence of glassy quartz-like hardness.
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