metamorphic
Unakite
Epidotized Granite (Composed of Orthoclase Feldspar, Epidote, and Quartz)
Hardness: 6-7 on Mohs scale; Color: Mottled green (epidote) and pink (orthoclase feldspar); Luster: Vitreous to dull; Crystal structure: Monoclinic/Trigonal; Cleavage: None in the rock itself; Specific gravity: 2.85-3.20
- Hardness
- 6-7 on Mohs scale
- Color
- Mottled green (epidote) and pink (orthoclase feldspar)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Mottled green (epidote) and pink (orthoclase feldspar); Luster: Vitreous to dull; Crystal structure: Monoclinic/Trigonal; Cleavage: None in the rock itself; Specific gravity: 2.85-3.20
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. It is commonly found in Proterozoic and Paleozoic era formations.
Uses & applications
Commonly used as a decorative stone, in lapidary work for cabochons and beads, architectural facings, and as an ornamental garden stone.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in North Carolina, USA. It is the state rock of Virginia.
Field identification & locations
Identify in the field by its distinctive 'pistachio green' and 'salmon pink' mottled appearance. Easily found in riverbeds and mountainous regions of North Carolina and Virginia (USA), as well as South Africa and Brazil.
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