metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs scale); Color: Mottled green (epidote), pink (orthoclase feldspar), and gray/clear (quartz); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic mixture; Specific Gravity: 2.85-3.00
- Hardness
- 6-7 (Mohs scale)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green (epidote), pink (orthoclase feldspar), and gray/clear (quartz); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic mixture; Specific Gravity: 2.85-3.00
Formation & geological history
Formed through hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Usually associated with ancient mountain-building events (often Proterozoic age).
Uses & applications
Commonly used as a decorative stone, architectural face stone, for carving figurines, and in lapidary work for cabochons and beads in jewelry.
Geological facts
Unakite was first discovered in the Unaka Range of the Appalachian Mountains in North Carolina/Tennessee, USA. It is also the state rock of Virginia.
Field identification & locations
Identify by its distinctive 'salmon and moss' color palette (pink and green). It is an excellent stone for beginning lapidarists because it takes a high polish. Common in riverbeds of the Blue Ridge Mountains.
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