metamorphic
Unakite
Epidotized Granite
Hardness: 6 to 7 on the Mohs scale. Color: Mottled green, pink, and gray. Luster: Vitreous to dull. Crystal structure: Result of the alteration of granite, non-foliated. Cleavage: Indistinct. Specific gravity: 2.85 to 3.20.
- Hardness
- 6 to 7 on the Mohs scale
- Color
- Mottled green, pink, and gray
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6 to 7 on the Mohs scale. Color: Mottled green, pink, and gray. Luster: Vitreous to dull. Crystal structure: Result of the alteration of granite, non-foliated. Cleavage: Indistinct. Specific gravity: 2.85 to 3.20.
Formation & geological history
Formed through hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by green epidote. This process typically occurs in deep-seated mountain ranges and cratons.
Uses & applications
Commonly used as a decorative stone, in lapidary work for cabochons and beads, and as an architectural cladding or crushed stone for construction projects.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in North Carolina, USA. It is considered the state rock of Virginia.
Field identification & locations
Identify by its unique pistachio-green and salmon-pink mottled appearance. It is commonly found in riverbeds and on beaches, particularly in the Appalachian mountains and the Great Lakes region of North America.
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