metamorphic
Tumbled epidote-bearing rock (likely epidote–quartz–feldspar aggregate)
Epidote-rich metamorphic rock; minerals likely epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH), quartz, feldspar, and dark amphibole/biotite)
AI-generated identification · may be incorrectPale pistachio-green, cream, brown, and black mottling with a granular texture and subdued vitreous-to-waxy luster; individual mineral grains are interlocking rather than showing clear crystals. Epidote hardness is about 6–7 Mohs; specific gravity commonly 3.3–3.5.
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Physical properties
Pale pistachio-green, cream, brown, and black mottling with a granular texture and subdued vitreous-to-waxy luster; individual mineral grains are interlocking rather than showing clear crystals. Epidote hardness is about 6–7 Mohs; specific gravity commonly 3.3–3.5.
Formation & geological history
Likely formed by hydrothermal alteration or regional metamorphism of volcanic or calcareous protoliths, commonly in greenschist- to epidote-amphibolite-facies conditions. The specimen is polished/tumbled, so its exact age and locality cannot be determined visually.
Uses & applications
Used mainly as a lapidary and collector stone; attractive epidote-rich material may be made into cabochons, beads, and carvings, but it has little structural or industrial use.
Geological facts
The green color is characteristic of iron-bearing epidote, while the white grains may be quartz or feldspar and the dark patches may be amphibole or biotite. Epidote commonly occurs in metamorphic veins and altered basaltic rocks.
Field identification & locations
Identify by its mottled pistachio-green color, granular intergrowth, moderate-high hardness, and absence of obvious banding; acid testing and hardness tests on an inconspicuous area can help distinguish carbonate-rich lookalikes. Common sources include Austria, Pakistan, Norway, Italy, and the western United States.
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