metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs); Color: Mottled green, pink, and orange-red; Luster: Vitreous to dull; Crystal Structure: Phaneritic (medium to coarse grained); Cleavage: None (fractures irregularly); Specific Gravity: 2.55-2.85.
- Hardness
- 6-7 (Mohs)
- Color
- Mottled green, pink, and orange-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs); Color: Mottled green, pink, and orange-red; Luster: Vitreous to dull; Crystal Structure: Phaneritic (medium to coarse grained); Cleavage: None (fractures irregularly); Specific Gravity: 2.55-2.85.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. It is typically associated with Precambrian basement rocks, dating back over 1 billion years.
Uses & applications
Used primarily as a decorative stone, for lapidary work such as beads, cabochons, and animal carvings. It is also used as an architectural stone and occasionally for high-quality construction aggregate.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in the United States. It is the state rock of Virginia and is considered a symbol of balance and grounding in metaphysical circles.
Field identification & locations
Identify in the field by its distinct 'pistachio' green epidote and pink orthoclase feldspar patches. It is commonly found as river stones and pebbles in areas with weathered granite complexes, particularly in the Appalachian Mountains and the Great Lakes region.
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