metamorphic
Unakite
Epidotized Granite (Ca2(Al, Fe)3(SiO4)3(OH))
Hardness: 6-7 Mohs; Color: Mottled green, pink, and gray; Luster: Dull to vitreous when polished; Crystal Structure: Monoclinic (Epidote) and Triclinic (Feldspar); Cleavage: Distinct in feldspar components.
- Hardness
- 6-7 Mohs
- Color
- Mottled green, pink, and gray
- Luster
- Dull to vitreous when polished
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Physical properties
Hardness: 6-7 Mohs; Color: Mottled green, pink, and gray; Luster: Dull to vitreous when polished; Crystal Structure: Monoclinic (Epidote) and Triclinic (Feldspar); Cleavage: Distinct in feldspar components.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by green epidote. Typically found as river cobbles or beach pebbles originating from ancient crystalline basement rocks.
Uses & applications
Used primarily as a decorative stone, for lapidary work such as cabochons, beads, and carvings. Also used as an architectural stone and aggregate.
Geological facts
Unakite takes its name from the Unaka Range of the Blue Ridge Mountains in the United States, where it was first discovered. It is often used in crystal healing to represent balance and grounding.
Field identification & locations
Identified by its unique 'pistachio' green and 'salmon' pink mottled appearance. Commonly found along the shores of Lake Superior in the US and in Virginia riverbeds. Collectors should look for balanced color distribution.
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