Unakite

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.

Identified on: 5/16/2026

Mode: Standard