metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs scale); Color: Mottled green (pistachio) and pink (salmon); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic mix; Cleavage: Poor/none; Specific gravity: 2.85-3.20
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled green (pistachio) and pink (salmon)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green (pistachio) and pink (salmon); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic mix; Cleavage: Poor/none; Specific gravity: 2.85-3.20
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epdiote. Commonly found in precambrian rocks and river beds as pebbles.
Uses & applications
Used primarily as a decorative stone in architecture, for lapidary work like cabochons and beads, and as a popular semi-precious stone for jewelry and crystal healing collections.
Geological facts
First discovered in the Unaka Mountains of North Carolina/Tennessee, USA, from which it takes its name. It is the state rock of Virginia.
Field identification & locations
Identify in the field by its distinct 'pistachio and salmon' color combination (green epidote and pink orthoclase). Commonly found in the Blue Ridge Mountains (USA), South Africa, and Brazil. Collectors look for a balanced distribution of both colors.
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