metamorphic
Serpentine-rich breccia (possibly listvenite)
Serpentinite breccia, with carbonate and quartz veins; exact identification requires testing
AI-generated identification · may be incorrectGreen to olive angular fragments are cemented or cut by pale tan-white veins. Serpentine minerals have Mohs hardness about 2.5–5.5 and waxy to greasy luster; the visible vein material may be calcite or quartz, so hardness varies across the specimen.
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Physical properties
Green to olive angular fragments are cemented or cut by pale tan-white veins. Serpentine minerals have Mohs hardness about 2.5–5.5 and waxy to greasy luster; the visible vein material may be calcite or quartz, so hardness varies across the specimen.
Formation & geological history
Likely formed when ultramafic rock was altered by water-rich fluids, then fractured and veined by carbonate and/or silica. Such alteration occurs in ophiolites and fault zones; the specimen’s age cannot be determined from the image.
Uses & applications
Decorative and collector specimen; serpentinite is also used as ornamental stone and, historically, as a source of asbestos-bearing minerals.
Geological facts
The contrasting green fragments and pale vein network suggest brecciation and later mineral filling, but this appearance alone cannot establish the rock’s exact composition.
Field identification & locations
Check a fresh surface: serpentine is relatively soft and may feel waxy; calcite veins fizz with dilute acid, while quartz does not. Serpentinite occurs in altered ultramafic belts worldwide, including California, Italy, and New Zealand.
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