metamorphic
Tumbled green stone, likely serpentine
Serpentine-group minerals, chiefly antigorite/lizardite; approximate formula Mg₃Si₂O₅(OH)₄
AI-generated identification · may be incorrectTypically olive to dark green, waxy to subvitreous luster, opaque, and smoothly polished; Mohs hardness 2.5–4, poor cleavage, and specific gravity about 2.5–2.6. The image is insufficient for certain identification; nephrite jade, green aventurine, or dyed stone are alternatives.
Identified More metamorphic →
Explore Tumbled green stone, likely serpentine in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Typically olive to dark green, waxy to subvitreous luster, opaque, and smoothly polished; Mohs hardness 2.5–4, poor cleavage, and specific gravity about 2.5–2.6. The image is insufficient for certain identification; nephrite jade, green aventurine, or dyed stone are alternatives.
Formation & geological history
Serpentine forms when magnesium-rich ultramafic rocks hydrate during hydrothermal or tectonic alteration, commonly in oceanic crust and subduction zones; ages range from ancient Precambrian to modern tectonic settings.
Uses & applications
Used as ornamental stone, carvings, beads, countertops, and decorative tumbled specimens; jade-like varieties may have higher value.
Geological facts
Serpentine often shows mottled green patterns and a smooth, greasy feel, while true jade is notably tougher and generally harder. Some varieties contain chrysotile asbestos and should not be cut or drilled without proper controls.
Field identification & locations
Common localities include California, Italy, New Zealand, Canada, and Afghanistan. Field clues are low hardness, green mottling, waxy feel, and resistance to weak acid; hardness and specific-gravity tests help separate it from jade and glass.
More like this
