metamorphic
Unakite
Epidotized Granite
Hardness: 6.0 to 7.0 Mohs; Color: Mottled green (epidote), pink (orthoclase), and clear/grey (quartz); Luster: Vitreous to dull; Crystal Structure: Monoclinic/Trigonal mix; Cleavage: None/Inconspicuous.
- Hardness
- 6
- Luster
- Vitreous to dull
Identified More metamorphic →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.0 to 7.0 Mohs; Color: Mottled green (epidote), pink (orthoclase), and clear/grey (quartz); Luster: Vitreous to dull; Crystal Structure: Monoclinic/Trigonal mix; Cleavage: None/Inconspicuous.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by crystalline epidote. It belongs to the high-grade metamorphic category and is typically found in mountainous regions.
Uses & applications
Used primarily as a decorative stone, for lapidary work such as beads and cabochons, carvings, architectural trim, and as a popular semi-precious gemstone for jewelry.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in North Carolina, USA, from which it derives its name. It is sometimes considered North Carolina's unofficial state stone.
Field identification & locations
Identify by its distinctive 'pistachio and ham' color scheme. It is found in riverbeds and mountainous outcrops. Collectors should look for a balanced distribution of pink and green for the highest aesthetic appeal.
More like this
