metamorphic
Unakite (Epidotized Granite)
Epidotized Granite (composed of Epidote, Orthoclase, and Quartz)
Hardness: 6-7 Mohs; Color: Mottled green, pink, and gray; Luster: Dull to vitreous; Structure: Massive/Granular; Cleavage: Prismatic (in epidote components); Specific Gravity: 2.85-3.20.
- Hardness
- 6-7 Mohs
- Color
- Mottled green, pink, and gray
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 Mohs; Color: Mottled green, pink, and gray; Luster: Dull to vitreous; Structure: Massive/Granular; Cleavage: Prismatic (in epidote components); Specific Gravity: 2.85-3.20.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Usually associated with Proterozoic age formations.
Uses & applications
Used primarily as a semi-precious gemstone for cabochons, beads, and carvings. Also used in architectural stone and landscaping.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in the United States, from which it takes its name.
Field identification & locations
Identified by its distinctive 'pistachio' green and 'salmon' pink color combination. Commonly found in riverbeds as water-worn pebbles in Virginia, North Carolina, and the Great Lakes region.
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