metamorphic
Unakite
Unakite (Epidotized Granite)
Hardness: 6-7 (Mohs); Color: Mottled green, pink, and orange-red; Luster: Vitreous to dull; Crystal structure: Monoclinic/Trigonal mix; Cleavage: None/Poor; Specific gravity: 2.85-3.20.
- Hardness
- 6-7 (Mohs)
- Color
- Mottled green, pink, and orange-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs); Color: Mottled green, pink, and orange-red; Luster: Vitreous to dull; Crystal structure: Monoclinic/Trigonal mix; Cleavage: None/Poor; Specific gravity: 2.85-3.20.
Formation & geological history
Formed through the hydrothermal alteration of granite, where plagioclase feldspar is replaced by epidote. It is commonly associated with the Precambrian period.
Uses & applications
Mainly used as a semi-precious gemstone for jewelry (beads, cabochons), lapidary carvings, architectural accents, and tumbled stones for collecting and metaphysical use.
Geological facts
Named after the Unaka Range in the Blue Ridge Mountains of North Carolina/Tennessee where it was first discovered. It is the state rock of Virginia.
Field identification & locations
Identify by its distinctive pistachio-green (epidote) and salmon-pink (orthoclase feldspar) mottled appearance. Primarily found in river beds and beach gravels in Virginia, USA, as well as South Africa, Brazil, and China.
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