mineral
Polished/tumbled stone, likely serpentine or agate
Probable serpentine-group mineral (antigorite/lizardite), possibly a green jasper or agate; image is insufficient for certainty
AI-generated identification · may be incorrectSmall polished translucent-to-opaque green specimen with darker linear banding and a bluish central zone; likely Mohs 3–6, waxy to vitreous luster, fine-grained and lacking visible cleavage. Color and pattern may also reflect dyed or composite lapidary material.
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Physical properties
Small polished translucent-to-opaque green specimen with darker linear banding and a bluish central zone; likely Mohs 3–6, waxy to vitreous luster, fine-grained and lacking visible cleavage. Color and pattern may also reflect dyed or composite lapidary material.
Formation & geological history
If serpentine, it formed by hydration and alteration of ultramafic mantle rocks during metamorphism, commonly in ophiolites; if agate/jasper, it formed from silica-rich groundwater filling volcanic cavities. Geological ages vary widely.
Uses & applications
Used as a decorative and carving stone, ornamental cabochon, or collector specimen; serpentine is also used for tiles and architectural objects. Typical small polished pieces have modest value.
Geological facts
The visible banding resembles natural mineral veining, but strong color saturation and the smooth cut surface prevent reliable identification from the photograph alone.
Field identification & locations
Check streak, hardness, translucency, and specific gravity; a loupe, scratch test, and UV response may help, while Raman/XRF testing is definitive. Common sources include California, New Zealand, Italy, and Afghanistan for serpentine-related material.
