metamorphic
Unakite
Epidotized Granite
Hardness: 6.0–7.0 Mohs; Color: Mottled green, pink, and orange-red; Luster: Vitreous to dull; Crystal structure: Monoclinic (Epidote) and Triclinic (Feldspar); Cleavage: Distinct to perfect in minerals, but overall irregular fracture.
- Hardness
- 6
- Color
- Mottled green, pink, and orange-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.0–7.0 Mohs; Color: Mottled green, pink, and orange-red; Luster: Vitreous to dull; Crystal structure: Monoclinic (Epidote) and Triclinic (Feldspar); Cleavage: Distinct to perfect in minerals, but overall irregular fracture.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. It is commonly associated with old mountain ranges and precambrian deposits.
Uses & applications
Primarily used as a decorative stone for lapidary work, including beads, cabochons, and small sculptures. It is also used in construction as an architectural stone.
Geological facts
Unakite was first discovered in the Unaka Mountains of North Carolina, USA, from which it derives its name. It is the state rock of Virginia.
Field identification & locations
Identify by its distinctive pistachio-green (epidote) and pink (orthoclase feldspar) dappled appearance. It is commonly found in riverbeds as smooth pebbles or glacially transported cobbles near the Blue Ridge Mountains.
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