metamorphic
Unakite (likely)
Epidote–pink feldspar–quartz rock; commonly termed unakite
AI-generated identification · may be incorrectTypically green epidote mixed with salmon-pink potassium feldspar and gray quartz, with a granular texture and vitreous to slightly dull luster. Hardness is about 6–7 Mohs; no prominent cleavage as a rock, though feldspar grains show cleavage; specific gravity is roughly 2.7–3.2.
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Physical properties
Typically green epidote mixed with salmon-pink potassium feldspar and gray quartz, with a granular texture and vitreous to slightly dull luster. Hardness is about 6–7 Mohs; no prominent cleavage as a rock, though feldspar grains show cleavage; specific gravity is roughly 2.7–3.2.
Formation & geological history
Formed by hydrothermal alteration or low-grade metamorphism of granite, replacing dark minerals with epidote while preserving feldspar and quartz. Classic unakite occurs in the Precambrian Unaka Mountains of North Carolina and Tennessee, though similar material is widespread and not necessarily age-diagnostic.
Uses & applications
Used as tumbled stone, cabochons, beads, carvings, and decorative aggregate; it has modest jewelry and lapidary value rather than major industrial importance.
Geological facts
The contrasting green-and-pink pattern is its defining feature, but many stones sold as unakite are visually similar epidote-rich altered granites.
Field identification & locations
Identify it by mottled salmon-pink feldspar, pistachio-green epidote, and gray quartz in a coarse crystalline matrix; common sources include the Appalachians, Brazil, South Africa, and China. The image supports unakite, though confirmation requires mineralogical testing.
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