metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs scale); Color: Mottled green (pistachio) and pink (salmon); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic (aggregate); 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 (aggregate); Specific Gravity: 2.85-3.20.
Formation & geological history
Formed through the hydro-thermal alteration of granite. As hot, mineral-rich water circulates through granite, the plagioclase feldspar is replaced by green epidote, while the orthoclase feldspar remains pink. Notable formations date back to the Precambrian era.
Uses & applications
Commonly used for lapidary work including beads, cabochons, and decorative carvings. It is also used as an architectural stone for floor tiles and stairs, and is highly valued by crystal collectors for aesthetic and metaphysical purposes.
Geological facts
First discovered in the Unaka Range of the Blue Ridge Mountains in North Carolina/Tennessee, USA. It is unique because it is one of the few rocks that is composed almost entirely of minerals with distinctly contrasting colors.
Field identification & locations
Identify in the field by its signature mottled 'pistachio and salmon' appearance. It is primarily found in the USA (Virginia, North Carolina), South Africa, and Brazil. Collectors should look for balanced color distribution between the pink feldspar and green epidote.
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