metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs); Color: Mottled green (epidote), pink (orthoclase), and clear/grey (quartz); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic; Opaque.
- Hardness
- 6-7 (Mohs)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs); Color: Mottled green (epidote), pink (orthoclase), and clear/grey (quartz); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic; Opaque.
Formation & geological history
Formed through hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Usually Found in metamorphic zones and as pebbles in glaciated areas.
Uses & applications
Used primarily as a decorative stone, in lapidary work for cabochons, beads, and carvings, and occasionally as architectural trim.
Geological facts
Unakite takes its name from the Unaka Range of the Appalachian Mountains in the United States, where it was first discovered. It is the state rock of Virginia.
Field identification & locations
Identify by its distinctive pink and green 'pistachio and ham' mottled appearance. Commonly found in riverbeds along the Blue Ridge Mountains and Lake Superior beaches.
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