metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs scale), Color: Mottled green and pink, Luster: Vitreous to dull, Crystal structure: Monoclinic (Epidote) and Triclinic (Feldspar), Specific Gravity: 2.85-3.20
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Mottled green and pink, Luster: Vitreous to dull, Crystal structure: Monoclinic (Epidote) and Triclinic (Feldspar), Specific Gravity: 2.85-3.20
Formation & geological history
Formed through slow hydrothermal metamorphism where plagioclase feldspar in granite is replaced by epidote, while orthoclase feldspar remains intact. Occurs in metamorphic zones.
Uses & applications
Commonly used as a decorative stone, architectural facing, jewelry (cabochons and beads), and as a popular stone for lapidary tumbling.
Geological facts
Unakite is named after the Unaka Range of mountains in North Carolina, USA, where it was first discovered. It is an altered form of granite.
Field identification & locations
Identified by its distinctive mottled pistachio-green (Epidote) and salmon-pink (Orthoclase) appearance. Often found in river beds as pebbles or in metamorphic rock outcroppings.
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