metamorphic
Tumbled serpentine-rich altered rock
Serpentinite, likely antigorite/lizardite with accessory carbonate, quartz, or iron oxides
AI-generated identification · may be incorrectMohs hardness about 2.5–4; pale green, cream, gray, and brown mottling; waxy to dull luster; massive, fine-grained texture with no visible crystal cleavage. The rounded, polished form indicates tumbling or water wear.
Identified More metamorphic →
Explore Tumbled serpentine-rich altered rock in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Mohs hardness about 2.5–4; pale green, cream, gray, and brown mottling; waxy to dull luster; massive, fine-grained texture with no visible crystal cleavage. The rounded, polished form indicates tumbling or water wear.
Formation & geological history
Formed when ultramafic mantle rocks such as peridotite were hydrated and metamorphosed, commonly during oceanic seafloor alteration or mountain-building; exact age and locality cannot be determined from the image.
Uses & applications
Used as an ornamental and carving stone, countertop or tile material, and collector specimen; softer pieces are commonly tumbled for display.
Geological facts
Serpentinite is named for its often snake-skin-like colors and patterns. Some varieties may contain chrysotile asbestos, so avoid cutting, drilling, or generating dust unless tested and handled safely.
Field identification & locations
Identify by its low hardness, pale green coloration, waxy feel, mottled appearance, and tendency to scratch with steel; definitive identification requires hardness, streak, specific gravity, and mineralogical testing. Common in ophiolites and tectonic fault zones worldwide.
More like this
