metamorphic
Unakite
Unakite (altered granitic rock)
Hardness: 6-7 (Mohs); Color: Mottled green (epidote) and pink/orange (orthoclase feldspar); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic minerals; Cleavage: Generally none as a rock; Specific gravity: 2.55-2.85.
- Hardness
- 6-7 (Mohs)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs); Color: Mottled green (epidote) and pink/orange (orthoclase feldspar); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic minerals; Cleavage: Generally none as a rock; Specific gravity: 2.55-2.85.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Many specimens date back to the Proterozoic eon and are commonly found in the Blue Ridge Mountains of the USA.
Uses & applications
Primarily used as a decorative stone for lapidary work, including cabochons, beads, and animal carvings. Occasionally used as architectural stone or floor tiles.
Geological facts
Unakite is named after the Unaka Range of the Blue Ridge Mountains in North Carolina/Tennessee where it was first discovered. It is the state rock of Virginia.
Field identification & locations
Identify by its distinctive pistachio-green and salmon-pink mottled appearance. Often found in riverbeds as water-worn pebbles. Collectors should look for balanced color distribution between the pink and green.
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