metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and orange/reddish brown; Luster: Vitreous to dull; Crystal Structure: Monoclinic/Trigonal (as a composite rock); Cleavage: Uneven; Specific Gravity: 2.85-3.20
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled green, pink, and orange/reddish brown
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and orange/reddish brown; Luster: Vitreous to dull; Crystal Structure: Monoclinic/Trigonal (as a composite rock); Cleavage: Uneven; Specific Gravity: 2.85-3.20
Formation & geological history
Formed through the hydrothermal alteration of granite, where plagioclase feldspar is replaced by epidote (green) while orthoclase feldspar (pink) remains stable. Often found in riverbeds and glacial drift.
Uses & applications
Used primarily as a gemstone for jewelry (beads, cabochons), metaphysical uses, decorative carvings, and architectural accents.
Geological facts
Unakite was first discovered in the Unaka Range of the Appalachian Mountains in North Carolina, USA, which is where it gets its name.
Field identification & locations
Identify in the field by its distinct 'pistachio' green and 'salmon' pink mottled appearance. It is very common in the Blue Ridge Mountains of the United States and along the shores of Lake Superior.
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