metamorphic
Unakite
Epidotized Granite (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH))
Hardness: 6-7 Mohs; Color: Mottled green (epidote), pink (orthoclase feldspar), and clear/grey (quartz); Luster: Vitreous to dull; Crystal Structure: Monoclinic/Triclinic mixture; Cleavage: None/Poor; Specific Gravity: 2.85-3.20
- 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 clear/grey (quartz); Luster: Vitreous to dull; Crystal Structure: Monoclinic/Triclinic mixture; Cleavage: None/Poor; Specific Gravity: 2.85-3.20
Formation & geological history
Formed through the hydrothermal alteration of granite where plagioclase feldspar is replaced by epidote. Usually associated with Precambrian or Paleozoic metamorphic terrains.
Uses & applications
Commonly used for lapidary work including beads, cabochons, carvings, and architectural tiles. It is also a popular collector's stone for its unique pink-and-green aesthetic.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in North Carolina, USA, which is where it derives its name. It is the state rock of Virginia.
Field identification & locations
Identify by its distinctive salmon-pink and pistachio-green 'mossy' appearance. Found commonly in riverbeds and beaches in the Blue Ridge area of the US and in Lake Superior pebbles. Collectors look for a balanced distribution of color.
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