metamorphic
Unakite
Unakite (Epidotized Granite)
Hardness: 6-7 Mohs; Color: Mottled green and pink; Luster: Vitreous to dull; Crystal structure: Monoclinic (Epidote) and Triclinic (Feldspar); Cleavage: None visible in rock form; Specific gravity: 2.85-3.20.
- Hardness
- 6-7 Mohs
- Color
- Mottled green and pink
- Luster
- Vitreous to dull
Identified More metamorphic →
Explore Unakite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6-7 Mohs; Color: Mottled green and pink; Luster: Vitreous to dull; Crystal structure: Monoclinic (Epidote) and Triclinic (Feldspar); Cleavage: None visible in rock form; Specific gravity: 2.85-3.20.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by pistachio-green epidote. It dates back to various geological eras depending on location, notably found in the Blue Ridge Mountains.
Uses & applications
Used primarily as a decorative stone, in lapidary work for cabochons and beads, as architectural trim, and as a popular stone for carving figurines or tumbled stones.
Geological facts
It was first discovered in the Unaka Range of the Blue Ridge Mountains in North Carolina, USA, from which it gets its name. It is the state rock of Virginia.
Field identification & locations
Look for the distinctive 'pistachio and ham' appearance (mottled green and pink). It is frequently found as river pebbles in areas with metamorphic history like the Appalachian Mountains and the shores of Lake Superior.
More like this
