metamorphic
Unakite Jasper / Unakite
Altered Granite (containing Epidote, Orthoclase Feldspar, and Quartz)
Hardness: 6-7 on Mohs scale. Color: Mottled green (epidote), pink to salmon red (orthoclase feldspar), and clear/grey/white (quartz). Luster: Vitreous to dull. Crystal Structure: Monoclinic/Triclinic/Hexagonal aggregate. Cleavage: Poor in aggregate form. Specific Gravity: ~2.85-3.20.
- Hardness
- 6-7 on Mohs scale
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Mottled green (epidote), pink to salmon red (orthoclase feldspar), and clear/grey/white (quartz). Luster: Vitreous to dull. Crystal Structure: Monoclinic/Triclinic/Hexagonal aggregate. Cleavage: Poor in aggregate form. Specific Gravity: ~2.85-3.20.
Formation & geological history
Formed through metasomatic alteration of granite. Hydrothermal fluids rich in calcium and iron alter plagioclase feldspar into green epidote, while pink orthoclase feldspar and quartz remain, creating the distinctive tri-color rock.
Uses & applications
Used extensively as an ornamental stone, lapidary material for cabochons, beads, carvings, and decorative tiles or countertops.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in North Carolina, USA, from which it derives its name. It is popular in gem therapy and lapidary arts due to its unique color contrast.
Field identification & locations
Identified by its distinctive combination of pistachio-green epidote, salmon-pink orthoclase feldspar, and glassy quartz. Commonly found in North Carolina, Virginia, South Africa, Brazil, and China. Collectors often look for rich green and bright pink color contrast.
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