mineral
Tumbled green stone, possibly serpentine or prehnite
Provisional identification: serpentine-group mineral, commonly antigorite; alternatively prehnite or green calcite
AI-generated identification · may be incorrectPale green, opaque to translucent, rounded and polished with a dull-to-waxy luster; likely Mohs 2.5–6 depending on species. The blurred image does not resolve cleavage, crystal structure, or specific gravity.
Identified More mineral →
Explore Tumbled green stone, possibly serpentine or prehnite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Pale green, opaque to translucent, rounded and polished with a dull-to-waxy luster; likely Mohs 2.5–6 depending on species. The blurred image does not resolve cleavage, crystal structure, or specific gravity.
Formation & geological history
Serpentine forms when ultramafic rocks undergo hydration and alteration, commonly in convergent-plate settings; prehnite forms in low-temperature hydrothermal veins and cavities. Geological ages vary widely.
Uses & applications
Tumbled pieces are sold as decorative specimens, craft stones, and metaphysical items; serpentine may also be carved or used decoratively, while prehnite is occasionally used in jewelry.
Geological facts
Identification is uncertain because the specimen is small, rounded, and out of focus; color alone cannot reliably distinguish green minerals.
Field identification & locations
Check streak, hardness, translucency, specific gravity, and reaction to dilute acid; serpentine is typically waxy and softer, whereas prehnite is harder and often translucent with a pearly sheen. Common sources include California, Italy, New Zealand, South Africa, and Australia.
