metamorphic
Unakite
Unakite Epidosite (composite of Epidote, Orthoclase, and Quartz)
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and gray; Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic/Hexagonal mix; Cleavage: None/Irregular fracture; Specific gravity: 2.85-3.20.
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled green, pink, and gray
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and gray; Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic/Hexagonal mix; Cleavage: None/Irregular fracture; Specific gravity: 2.85-3.20.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidemic. Most specimens date back to the Proterozoic Era (approx. 1 billion years old).
Uses & applications
Commonly used in lapidary work for cabochons, beads, and decorative spheres. It is also used as a minor architectural stone/cladding and for metaphysical carving.
Geological facts
First discovered in the Unaka Mountains of North Carolina, USA. It is unique because it is one of the few rocks that consists of a distinct blend of three minerals that remain clearly visible to the naked eye.
Field identification & locations
Identify by its unique 'pistachio nut' appearance (green epidote mixed with salmon-pink orthoclase). It is widely found in river beds and beach gravel in the Blue Ridge Mountains and around the Great Lakes.
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