metamorphic
Unakite
Unakite (Epidotized Granite)
Hardness: 6-7 (Mohs scale); Color: Mottled green and pink/orange; Luster: Dull to vitreous; Crystal Structure: Monoclinic, Triclinic (mixture of minerals); Cleavage: None; Specific Gravity: 2.85-3.00
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled green and pink/orange
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green and pink/orange; Luster: Dull to vitreous; Crystal Structure: Monoclinic, Triclinic (mixture of minerals); Cleavage: None; Specific Gravity: 2.85-3.00
Formation & geological history
Formed through hydrothermal metamorphism of granite where plagioclase feldspar is replaced by epidote. Usually associated with the Blue Ridge Mountains in the United States.
Uses & applications
Commonly used as a decorative stone, semi-precious gemstone for jewelry (cabochons and beads), and in architectural ornaments.
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 'Christmas' color scheme of pistachio green and salmon pink. It is commonly found in riverbeds as water-worn pebbles in the Appalachian region.
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