metamorphic
Unakite
Unakite (Epidotized Granite)
Hardness: 6-7 (Mohs), Color: Mottled green, pink, and gray/clear, Luster: Vitreous to dull, Crystal Structure: Monoclinic/Trigonal (matrix), Specific Gravity: 2.85-3.00
Identified More metamorphic →
Explore Unakite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6-7 (Mohs), Color: Mottled green, pink, and gray/clear, Luster: Vitreous to dull, Crystal Structure: Monoclinic/Trigonal (matrix), Specific Gravity: 2.85-3.00
Formation & geological history
Formed through the hydrothermal alteration of granite, where plagioclase feldspar is replaced by epidote. Usually associated with Precambrian or Paleozoic metamorphic belts.
Uses & applications
Widely used for lapidary work, cabochons, decorative beads, architectural facings, and small carvings.
Geological facts
Named after the Unaka Range of the Appalachian Mountains in North Carolina/Tennessee where it was first discovered. It is the state rock of Virginia.
Field identification & locations
Identify by its unique pistachio-green (epidote) and pink (orthoclase) mottled appearance. Found in river beds and beach gravels in the Great Lakes region and the Blue Ridge Mountains.
More like this
