metamorphic
Unakite
Unakite (Altered Granite)
Hardness: 6-7 Mohs; Color: Mottled green (epidote) and pink (orthoclase feldspar); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic mixture; Cleavage: Irregular; Specific gravity: 2.85-3.20
- Hardness
- 6-7 Mohs
- Color
- Mottled green (epidote) and pink (orthoclase feldspar)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 Mohs; Color: Mottled green (epidote) and pink (orthoclase feldspar); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic mixture; Cleavage: Irregular; Specific gravity: 2.85-3.20
Formation & geological history
Formed through hydrothermal metamorphism of granite where plagioclase feldspar is replaced by epidote. It is commonly found in Proterozoic aged formations but occurs globally in metamorphic belts.
Uses & applications
Used primarily as a decorative stone, in lapidary work for cabochons and beads, as architectural trim, and for metaphysical collecting.
Geological facts
Named after the Unaka Range in North Carolina, USA, where it was first discovered. It is the state rock of Virginia. High-quality specimens are often highly polished to reveal the vibrant color contrast.
Field identification & locations
Identified in the field by its distinct 'pistachio' green and 'salmon' pink mottled pattern. It is frequently found as pebbles in riverbeds or on beaches in the Blue Ridge Mountains and Lake Superior regions.
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