metamorphic
Unakite
Unakite (Metasomatized Granite)
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and gray; Luster: Vitreous to dull; Crystal Structure: Grainy (aggregate of epidote, orthoclase, and quartz); Cleavage: Uneven; Specific Gravity: 2.85-3.26.
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled green, pink, and gray
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and gray; Luster: Vitreous to dull; Crystal Structure: Grainy (aggregate of epidote, orthoclase, and quartz); Cleavage: Uneven; Specific Gravity: 2.85-3.26.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. It is often found in riverbeds and as glacial float, originating from Precambrian mountain ranges.
Uses & applications
Commonly used as a lapidary stone for beads, cabochons, and animal carvings. It is also used in construction as a decorative architectural stone and for gravel.
Geological facts
First discovered in the Unaka Range of the Blue Ridge Mountains in the United States. It is the state rock of Virginia and is believed by some practitioners to have grounding spiritual properties.
Field identification & locations
Identify by its distinctive pistachio-green (epidote) and salmon-pink (feldspar) mottled appearance. Common in Virginia and North Carolina, USA, and along the shores of Lake Superior.
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