metamorphic
Weathered red-and-green metamorphic rock
Probable epidote-amphibolite or altered schist; exact identification requires testing
AI-generated identification · may be incorrectFine- to medium-grained, earthy brown with muted red and green patches, dull to weakly subvitreous luster, and irregular fracture; estimated Mohs hardness 5–7. Likely contains epidote, amphibole, chlorite, quartz, and feldspar, but no diagnostic crystals are visible.
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Physical properties
Fine- to medium-grained, earthy brown with muted red and green patches, dull to weakly subvitreous luster, and irregular fracture; estimated Mohs hardness 5–7. Likely contains epidote, amphibole, chlorite, quartz, and feldspar, but no diagnostic crystals are visible.
Formation & geological history
Probably formed when basaltic or volcanic protolith was metamorphosed and hydrothermally altered, then weathered; age cannot be determined from the photograph. Such rocks commonly occur in metamorphic belts and altered oceanic crust.
Uses & applications
Typically a common collecting or landscaping stone; attractive pieces may be polished for ornaments, but this specimen has limited commercial value.
Geological facts
The red coloration may come from iron oxides or garnet, while green areas may reflect epidote or chlorite. Color alone cannot distinguish it reliably from weathered volcanic or sedimentary rocks.
Field identification & locations
Look for a dark, dense matrix with green epidote/amphibole and red iron staining; a streak, hardness, magnetism, acid, and thin-section test would refine identification. Common in regional metamorphic terrains worldwide.
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