metamorphic
Unakite (likely)
Unakite; epidote–K-feldspar–quartz rock
AI-generated identification · may be incorrectPink salmon-colored areas are potassium feldspar, green patches are epidote, and pale translucent zones are quartz. Hardness is about 6–7 Mohs, with a granular texture, vitreous to dull luster, and no prominent cleavage in the rounded specimen.
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Physical properties
Pink salmon-colored areas are potassium feldspar, green patches are epidote, and pale translucent zones are quartz. Hardness is about 6–7 Mohs, with a granular texture, vitreous to dull luster, and no prominent cleavage in the rounded specimen.
Formation & geological history
Formed when granite underwent hydrothermal alteration, converting dark minerals to epidote while preserving feldspar and quartz; it is generally Precambrian to Paleozoic in age depending on locality. Commonly occurs in altered mountain belts and stream gravels.
Uses & applications
Used as a decorative and lapidary stone for cabochons, beads, carvings, and tumbled stones; it has little industrial value. Polishes well and is popular with collectors.
Geological facts
The name comes from the Unaka Mountains of Tennessee and North Carolina, a classic locality. Similar pink-and-green rocks may be epidote-rich granite or altered granite rather than strict unakite.
Field identification & locations
Identify it by the distinctive mottled pink feldspar, green epidote, and quartz combination; it is typically opaque and coarse-grained. Common sources include the Appalachian Mountains, especially Tennessee and North Carolina, plus Brazil and South Africa.
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