metamorphic
Polished banded green stone, likely serpentine or altered volcanic rock
Probable serpentine-rich serpentinite; exact identification requires testing
AI-generated identification · may be incorrectDark green to black, waxy-to-submetallic luster, irregular pale veins and banding; likely Mohs 3–5, with no obvious crystal faces. The rounded, glossy surface indicates tumbling or polishing.
Identified More metamorphic →
Explore Polished banded green stone, likely serpentine or altered volcanic rock in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Dark green to black, waxy-to-submetallic luster, irregular pale veins and banding; likely Mohs 3–5, with no obvious crystal faces. The rounded, glossy surface indicates tumbling or polishing.
Formation & geological history
Serpentinite forms when ultramafic mantle rocks hydrate during metamorphism, commonly along tectonic plate boundaries; formation ages vary widely from Precambrian to modern oceanic settings. Pale veins may contain calcite, magnesite, or quartz.
Uses & applications
Used as ornamental stone, carvings, countertops, and cabochons; attractive polished pieces are collectible but usually inexpensive.
Geological facts
Serpentine is a mineral-group name rather than one exact mineral; common varieties include antigorite, lizardite, and chrysotile. Some serpentinite can contain trace asbestos-form minerals, so avoid cutting or generating dust.
Field identification & locations
Look for a relatively soft, green, waxy stone with black veining and a soapy feel; a steel nail may scratch it. Common localities include California, New Zealand, Italy, Canada, and metamorphic belts worldwide.
More like this
