metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs scale). Color: Mottled green (epidote), pink (orthoclase feldspar), and gray (quartz). Luster: Vitreous to dull. Crystal system: Monoclinic, triclinic, and trigonal (composite). Specific Gravity: 2.85-3.20.
- Hardness
- 6-7 (Mohs scale)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale). Color: Mottled green (epidote), pink (orthoclase feldspar), and gray (quartz). Luster: Vitreous to dull. Crystal system: Monoclinic, triclinic, and trigonal (composite). Specific Gravity: 2.85-3.20.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Generally found in Precambrian to Paleozoic geological formations.
Uses & applications
Used primarily as a semiprecious gemstone for lapidary work, including beads, cabochons, and decorative carvings. It is also used as an architectural stone.
Geological facts
Unakite is named after the Unaka Range of the Blue Ridge Mountains in North Carolina/Tennessee where it was first discovered. It is the state rock of Virginia.
Field identification & locations
Identify in the field by its distinct mottled pink and green 'pistachio' appearance. It is commonly found as pebbles and cobbles in riverbeds downstream from metamorphic mountain ranges, especially in the Blue Ridge Mountains of the USA, South Africa, and Brazil.
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