metamorphic
Polished greenstone pebble (likely epidote-bearing stone)
Epidote–chlorite amphibolite or altered basalt; composition likely epidote, chlorite, amphibole/pyroxene, and iron oxides
AI-generated identification · may be incorrectDark green to blue-green with reddish-brown iron-oxide patches and a polished/worn surface; typically Mohs 6–7, vitreous to dull luster, fine-grained and massive, with no obvious cleavage. Exact identification requires hardness, streak, and mineralogical testing.
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Physical properties
Dark green to blue-green with reddish-brown iron-oxide patches and a polished/worn surface; typically Mohs 6–7, vitreous to dull luster, fine-grained and massive, with no obvious cleavage. Exact identification requires hardness, streak, and mineralogical testing.
Formation & geological history
Likely formed by low- to medium-grade metamorphism or hydrothermal alteration of basaltic rock; such rocks range from Precambrian to young accreted terranes. The rounded shape indicates stream or beach transport, followed by natural or human polishing.
Uses & applications
Used mainly as a decorative, lapidary, or collecting stone; not generally a major construction material in pebble form. Attractive examples may be cut into cabochons or sold as polished stones.
Geological facts
Epidote-rich greenstones commonly show contrasting pistachio-green, dark green, and rusty-red colors from oxidation. The image alone cannot distinguish this confidently from serpentine, jasper, or other altered mafic rocks.
Field identification & locations
Check for a green streak or pale streak, hardness sufficient to scratch glass, and visible granular or fibrous texture; a gemological or thin-section test can confirm the minerals. Common settings include metamorphic belts and altered volcanic terrains worldwide.
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