metamorphic
Unakite
Unakite (Epidotized Granite)
Hardness: 6-7 (Mohs scale); Color: Mottled green and pink/orange; Luster: Vitreous to dull; Crystal structure: Monoclinic and Trigonal components; Specific Gravity: 2.85-3.20.
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled green and pink/orange
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green and pink/orange; Luster: Vitreous to dull; Crystal structure: Monoclinic and Trigonal components; Specific Gravity: 2.85-3.20.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Found typically in Precambrian and Paleozoic geological formations.
Uses & applications
Used primarily as a semi-precious gemstone for beads, cabochons, and carvings. Also used in architectural tiles and as an ornamental stone in landscaping.
Geological facts
First discovered in the Unaka Range of North Carolina, USA. It is the state rock of Virginia and is frequently found as river pebbles in areas with high glacial activity.
Field identification & locations
Identify by its distinctive pistachio-green (epidote) and salmon-pink (orthoclase) mottled appearance. Commonly found along the shores of Lake Superior and in the Blue Ridge Mountains.
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