metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs scale); Color: Mottled green (epidote), pink (orthoclase), and colorless/grey (quartz); Luster: Vitreous to dull; Crystal structure: Phaneritic (granitic texture); Specific gravity: 2.85-3.00
- Hardness
- 6-7 (Mohs scale)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green (epidote), pink (orthoclase), and colorless/grey (quartz); Luster: Vitreous to dull; Crystal structure: Phaneritic (granitic texture); Specific gravity: 2.85-3.00
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. It is associated with old mountain ranges like the Blue Ridge Mountains in the USA.
Uses & applications
Primarily used as a decorative stone, semi-precious gemstone for jewelry (cabochons and beads), architectural facing, and lapidary carvings.
Geological facts
Unakite was first discovered in the Unaka Range of North Carolina, USA. It is unique among rocks because it contains both a pink feldspar and green epidote, which are rarely found together in such high concentrations.
Field identification & locations
Identify by its distinctive salmon-pink and pistachio-green mottled appearance. It is commonly found in riverbeds and pebble beaches where Appalachian glacial drift or erosion has deposited it.
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