metamorphic
Unakite (Epidotized Granite)
Epidotized Granite
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and grey; Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic mixture; Cleavage: None (fractures unevenly); Specific Gravity: 2.85-3.20.
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled green, pink, and grey
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and grey; Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic mixture; Cleavage: None (fractures unevenly); 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 Precambrian or Paleozoic geological ages.
Uses & applications
Commonly used as a lapidary stone for cabochons, beads, and carvings; also used in construction as an ornamental architectural stone and in aggregate.
Geological facts
Unakite was first discovered in the Unaka Range of North Carolina, USA. It is often used as a gemstone to represent balance and grounding due to its unique combination of pink and green hues.
Field identification & locations
Identify by its distinct mottled 'pistachio green' (epidote) and 'salmon pink' (orthoclase feldspar) appearance. Common in riverbeds in the Blue Ridge Mountains and Lake Superior shores. It will not react with acid.
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