metamorphic
Unakite (likely, rough specimen)
Epidote–feldspar–quartz rock; commonly approximated as pink orthoclase + green epidote + quartz
AI-generated identification · may be incorrectTypically pink-and-green, granular, opaque, with a vitreous to dull luster; hardness about 6–7 Mohs, no strong cleavage as a rock, and specific gravity roughly 2.8–3.2. The specimen’s colors and texture fit unakite, though the dark cavity and surface weathering limit certainty.
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Physical properties
Typically pink-and-green, granular, opaque, with a vitreous to dull luster; hardness about 6–7 Mohs, no strong cleavage as a rock, and specific gravity roughly 2.8–3.2. The specimen’s colors and texture fit unakite, though the dark cavity and surface weathering limit certainty.
Formation & geological history
Formed when granite underwent hydrothermal alteration, replacing some feldspar and quartz with green epidote; generally Paleozoic to Precambrian source rocks, depending on locality. Commonly associated with altered granitic terranes.
Uses & applications
Used as a lapidary stone for cabochons, beads, carvings, and polished stones; occasionally used decoratively in small architectural pieces. Rough common material has modest collector value.
Geological facts
The green component is epidote, while salmon-pink areas are usually potassium feldspar; quartz may appear as gray or translucent patches. Color intensity varies substantially with alteration and weathering.
Field identification & locations
Common in the Unaka Mountains of North Carolina and Tennessee, and found in altered granite regions worldwide. Identify it by its distinctive mottled pink-green pattern, granular texture, and inability to scratch easily with a steel knife; verify with hardness and mineralogical testing.
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