metamorphic
Unakite
Epidotized Granite (SiO2, KAlSi3O8, Ca2(Al, Fe)3(SiO4)3(OH))
Hardness: 6–7 Mohs; Color: Mottled green (epidote), pink (orthoclase feldspar), and gray (quartz); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic mixture; Cleavage: Poor; Specific gravity: 2.85 to 3.20.
- Hardness
- 6–7 Mohs
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6–7 Mohs; Color: Mottled green (epidote), pink (orthoclase feldspar), and gray (quartz); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic mixture; Cleavage: Poor; Specific gravity: 2.85 to 3.20.
Formation & geological history
Formed through the hydro-thermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Most specimens are from the Precambrian to Paleozoic eras.
Uses & applications
Commonly used in jewelry (cabochons and beads), decorative carvings, architectural facing stone, and in 'crystal healing' practices. It is a popular lapidary material due to its ability to take a high polish.
Geological facts
Unakite takes its name from the Unaka Range in the Appalachian Mountains of the southeastern United States, where it was first discovered. It is the state rock of Virginia.
Field identification & locations
Identify in the field by its distinct 'pistachio and salmon' mottled appearance. Commonly found as pebbles in riverbeds or glacial till in the Unaka Mountains (USA), South Africa, and Brazil. Collectors look for a balanced distribution of pink and green.
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