metamorphic
Unakite
Unakite (Epidotized Granite)
Hardness: 6-7 (Mohs); Color: Mottled green (epidote), pink to orange (orthoclase), and gray (quartz); Luster: Vitreous to dull; Crystal Structure: Monoclinic/Trigonal; Specific Gravity: 2.85-3.20
- Hardness
- 6-7 (Mohs)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs); Color: Mottled green (epidote), pink to orange (orthoclase), and gray (quartz); Luster: Vitreous to dull; Crystal Structure: Monoclinic/Trigonal; Specific Gravity: 2.85-3.20
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Usually associated with Precambrian or Paleozoic geological ages.
Uses & applications
Used primarily as a gemstone for beads and cabochons, architectural stone, and decorative carvings; it is also popular in lapidary work and metaphysical collections.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in the United States, which is how it earned its name. It is the state rock of Virginia.
Field identification & locations
Identify by its distinctive pistachio-green and salmon-pink mottled appearance. It is commonly found in riverbeds as smoothed pebbles or in mountainous outcrops in North Carolina and Virginia.
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