metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and orange; Luster: Vitreous to dull; Crystal structure: Monoclinic (epidote) and Triclinic (feldspar); Cleavage: Uneven to splintery fracture; Specific gravity: 2.85-3.20.
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled green, pink, and orange
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and orange; Luster: Vitreous to dull; Crystal structure: Monoclinic (epidote) and Triclinic (feldspar); Cleavage: Uneven to splintery fracture; Specific gravity: 2.85-3.20.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Usually dates back to the Proterozoic era (approximately 1 billion years old).
Uses & applications
Commonly used as a decorative stone, in lapidary for cabochons and beads, as architectural stone for countertops or floor tiles, and as an ornamental landscaping stone.
Geological facts
Unakite was first discovered in the Unaka Range of the Appalachian Mountains in the United States and is the state rock of Virginia. It is unique because it contains both pink orthoclase and green epidote.
Field identification & locations
Identify in the field by its distinct 'pistachio' green and 'salmon' pink mottled appearance. It is commonly found in riverbeds and on beaches in the Great Lakes region and the Blue Ridge Mountains. Collectors should look for balanced color distribution.
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