metamorphic
Tumbled green-blue stone, likely serpentine or chlorite-rich metamorphic rock
Serpentinite (mainly antigorite/lizardite; identification is image-based)
AI-generated identification · may be incorrectTypically Mohs 2.5–4, dark green to blue-green, mottled, waxy to greasy luster, and fine-grained with no visible crystal faces; specific gravity about 2.5–2.6. The rounded surface indicates tumbling or natural abrasion.
Identified More metamorphic →
Explore Tumbled green-blue stone, likely serpentine or chlorite-rich metamorphic rock in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Typically Mohs 2.5–4, dark green to blue-green, mottled, waxy to greasy luster, and fine-grained with no visible crystal faces; specific gravity about 2.5–2.6. The rounded surface indicates tumbling or natural abrasion.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite undergo hydration and metamorphism, commonly in ancient or active tectonic zones; ages vary widely. Its blue-green appearance may also reflect chlorite, magnetite, or other accessory minerals.
Uses & applications
Used as an ornamental and carving stone, tumbled-stone material, and historically in architecture; attractive pieces may be sold as decorative specimens. Avoid dust from cutting because some serpentinite can contain asbestos-form minerals.
Geological facts
Serpentinite often shows black magnetite specks and a slippery, waxy feel. It may be weakly magnetic and can be confused with nephrite, chlorite schist, or dyed material.
Field identification & locations
Common in ophiolite belts and mountain regions, including California, the Alps, New Zealand, and the Appalachians. Field confirmation requires hardness, streak, magnetism, and ideally microscopy or spectroscopy.
More like this
