metamorphic
Polished serpentine (likely bowenite)
Serpentine-group minerals, chiefly antigorite, Mg₃Si₂O₅(OH)₄; may contain magnetite and carbonate veins
AI-generated identification · may be incorrectMohs hardness 2.5–4, waxy to greasy luster, opaque to translucent, rounded polished surface, and mottled green, yellow, brown, and black veining. Serpentine has a fine-grained monoclinic/triclinic crystal structure and poor cleavage; the image alone cannot confirm the exact variety.
Identified More metamorphic →
Explore Polished serpentine (likely bowenite) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Mohs hardness 2.5–4, waxy to greasy luster, opaque to translucent, rounded polished surface, and mottled green, yellow, brown, and black veining. Serpentine has a fine-grained monoclinic/triclinic crystal structure and poor cleavage; the image alone cannot confirm the exact variety.
Formation & geological history
Forms when magnesium-rich ultramafic rocks such as peridotite undergo hydrothermal metamorphism and hydration, commonly in ophiolite belts. Most specimens are geologically ancient, from Paleozoic to Mesozoic or younger tectonic complexes.
Uses & applications
Used as an ornamental stone for cabochons, carvings, beads, and polished objects; massive serpentine has also been used for decorative stone and limited construction applications.
Geological facts
The black areas may reflect magnetite or dark serpentine, while pale zones can be carbonate or altered serpentine. It is often mistaken for jade, but is generally softer and less dense.
Field identification & locations
Common in California, Italy, New Zealand, Canada, Afghanistan, and parts of the U.S. Pacific Northwest. Field clues include a soft, waxy feel and green mottling; hardness and specific-gravity tests help distinguish it from jade.
More like this
