metamorphic
Unakite Jasper
Epidotized Granite
Hardness: 6 to 7 (Mohs); Color: Mottled green (epidote) and pink/orange (orthoclase feldspar) often with clear quartz; Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic mixture; Cleavage: Generally none in massive form.
- Hardness
- 6 to 7 (Mohs)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6 to 7 (Mohs); Color: Mottled green (epidote) and pink/orange (orthoclase feldspar) often with clear quartz; Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic mixture; Cleavage: Generally none in massive form.
Formation & geological history
Formed through the hydrothermal alteration of granite, where plagioclase feldspar is replaced by epidote. Primarily associated with metamorphic processes in old mountain ranges.
Uses & applications
Commonly used as a semi-precious gemstone for beads, cabochons, carvings, and architectural accents. Highly valued in lapidary for its unique color combination.
Geological facts
Unakite was first discovered in the Unaka Range of North Carolina, USA. It is often referred to as the 'granite of the south' and is the state rock of Virginia.
Field identification & locations
Identify by its distinctive combination of pistachio green and salmon pink. It is commonly found in riverbeds and as glacial drift in the Great Lakes region and the Blue Ridge Mountains.
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