metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and gray; Luster: Vitreous to dull; Structure: Coarse-grained phaneritic; Cleavage: Poor; Specific Gravity: 2.85-3.20.
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled green, pink, and gray
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and gray; Luster: Vitreous to dull; Structure: Coarse-grained phaneritic; Cleavage: Poor; Specific Gravity: 2.85-3.20.
Formation & geological history
Formed through hydrothermal metamorphisim of granite, where plagioclase feldspar is replaced by epidote. Usually associated with older basement complexes like those in the Blue Ridge Mountains (Proterozoic era).
Uses & applications
Used as a semi-precious gemstone for cabochons, beads, and carvings; also used in construction as an ornamental building stone or decorative gravel.
Geological facts
Named after the Unaka Range in North Carolina, USA, where it was first discovered. It is the state rock of Virginia.
Field identification & locations
Identified by its distinctive 'pistachio green' (epidote) and 'salmon pink' (orthoclase) coloration. Often found as water-worn pebbles in riverbeds downstream from metamorphic mountain ranges.
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