metamorphic
Unakite
Altered Granite (Epidotized Granite)
Hardness: 6-7 on the Mohs scale; Color: Mottled green (epidote) and pink/red (orthoclase feldspar) with clear/white quartz; Luster: Vitreous to dull when polished; Crystal structure: Monoclinic and triclinic components; Cleavage: Good to distinct; Specific gravity: 2.6-3.0
- Hardness
- 6-7 on the Mohs scale
- Luster
- Vitreous to dull when polished
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Physical properties
Hardness: 6-7 on the Mohs scale; Color: Mottled green (epidote) and pink/red (orthoclase feldspar) with clear/white quartz; Luster: Vitreous to dull when polished; Crystal structure: Monoclinic and triclinic components; Cleavage: Good to distinct; Specific gravity: 2.6-3.0
Formation & geological history
Formed through hydrothermal alteration of granite, where hot waters altered the original plagioclase feldspar into epidote. Found in mountainous regions and glacial deposits.
Uses & applications
Used for making cabochons, beads, small carved decorative objects, and tumbled stones for jewelry and lapidary work.
Geological facts
Unakite was first discovered in the Unaka Mountains of North Carolina, from which it gets its name. It is structurally a granite rock, but chemically altered to include significant green epidote.
Field identification & locations
Easily identified by its distinct pink and green speckled or mottled appearance. Found worldwide including the USA, South Africa, Brazil, and China.
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