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: Monoclinic/Triclinic mixture; Cleavage: Generally poor; 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: Monoclinic/Triclinic mixture; Cleavage: Generally poor; Specific Gravity: 2.85-3.00
Formation & geological history
Formed from the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Heavily associated with the Blue Ridge Mountains of the United States (Proterozoic era).
Uses & applications
Primarily used as a semi-precious gemstone for jewelry (beads, cabochons), decorative carvings, architectural facing, and as a popular river-tumble for rock hounding.
Geological facts
Unakite was named after the Unaka Range in North Carolina, USA, where it was first discovered. It is the state rock of Virginia.
Field identification & locations
Identify by its unique 'pistachio green' and 'salmon pink' mottling. It is frequently found as water-worn pebbles in riverbeds and on beaches in the Appalachian region and around the Great Lakes.
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