metamorphic
Serpentine-rich metamorphic rock (possibly serpentinite)
Serpentinite; chiefly antigorite, lizardite, or chrysotile with possible magnetite and carbonate minerals
AI-generated identification · may be incorrectDark gray-green, waxy to dull luster, massive and fine-grained, with pale yellow-green veining or weathering. Hardness is typically 2.5–4 Mohs; specific gravity about 2.5–2.6. The rounded shape appears water-worn or polished.
Identified More metamorphic →
Explore Serpentine-rich metamorphic rock (possibly serpentinite) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Dark gray-green, waxy to dull luster, massive and fine-grained, with pale yellow-green veining or weathering. Hardness is typically 2.5–4 Mohs; specific gravity about 2.5–2.6. The rounded shape appears water-worn or polished.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite undergo hydration and metamorphism, commonly along oceanic crust and tectonic fault zones. Ages vary widely, from Precambrian to modern tectonic settings.
Uses & applications
Used as ornamental stone, carvings, countertops, and historically as a source of asbestos-bearing material; attractive specimens are collected, though fibrous varieties should not be cut or abraded.
Geological facts
Yellow-green networks commonly reflect serpentine veins, while dark spots may be magnetite or remnants of original olivine/pyroxene. The photograph alone cannot distinguish serpentinite from some dark basalt or altered ultramafic rocks with certainty.
Field identification & locations
Look for greenish color, greasy/waxy feel, low hardness, veining, and occasional attraction to a magnet. Common localities include California, Vermont, Italy, New Zealand, and many ophiolite belts.
More like this
