metamorphic
Unakite (or Epidote-rich Granite)
Unakite (composed of Epidote {Ca2(Al, Fe)3(SiO4)3(OH)}, Pink Orthoclase Feldspar {KAlSi3O8}, and Quartz {SiO2})
Hardness: 6.0 to 7.0 on Mohs scale. Color: Mottled green (epidote), pink (feldspar), and gray/clear (quartz). Luster: Vitreous to dull. Specific Gravity: 2.85 to 3.20.
- Hardness
- 6
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.0 to 7.0 on Mohs scale. Color: Mottled green (epidote), pink (feldspar), and gray/clear (quartz). Luster: Vitreous to dull. Specific Gravity: 2.85 to 3.20.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Ages vary but often associated with Precambrian formations.
Uses & applications
Primarily used as a decorative stone, in lapidary work for cabochons and beads, and as an architectural stone for countertops or floor tiles.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in the United States. It is the state rock of Virginia.
Field identification & locations
Identify in the field by its distinct 'pistachio' green and 'salmon' pink mottled appearance with no distinct foliation. Commonly found in riverbeds and beaches where glacial or fluvial transport has moved it from mountain sources.
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