metamorphic
Unakite
Epidotized Granite (composition: K-feldspar, Epidote, and Quartz)
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and grey; Luster: Vitreous to dull; Crystal structure: Monoclinic/Trigonal mix; Cleavage: None/Irregular fracture; Specific gravity: 2.85-3.00
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled green, pink, and grey
- Luster
- Vitreous to dull
Identified More metamorphic →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and grey; Luster: Vitreous to dull; Crystal structure: Monoclinic/Trigonal mix; Cleavage: None/Irregular fracture; Specific gravity: 2.85-3.00
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Typically Proterozoic in age and found in regional metamorphic belts.
Uses & applications
Used primarily as a lapidary stone for beads, cabochons, and decorative carvings. Occasionally used as architectural stone for tiles or gravel.
Geological facts
Named after the Unaka Range of North Carolina, USA, where it was first discovered. It is often used as a gemstone for those seeking emotional balance.
Field identification & locations
Identified by its unique 'pistachio-green' and 'salmon-pink' mottled appearance. Commonly found in riverbeds in the Blue Ridge Mountains and along the shores of Lake Superior as glacial drift.
More like this
