Unakite

Physical Properties

Hardness: 6-7 Mohs; Color: Mottled green (epidote) and pink (orthoclase feldspar); Luster: Vitreous to dull; Crystal Structure: Monoclinic (epidote) and Monoclinic/Triclinic (feldspar); Specific Gravity: 2.85-3.20

Formation & Geological History

Formed through the hydrothermal alteration of granite where plagioclase feldspar is replaced by epidote. This metasomatic process typically occurs in deep-seated geological environments.

Uses & Applications

Primarily used as a lapidary stone for beads, cabochons, carvings, and architectural accents. It is also used in construction as a decorative crushed stone or for countertops.

Geological Facts

Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in the United States, which is where it earned its name. It is the state rock of Virginia.

Field Identification & Locations

Identify by its distinctive pistachio-green and salmon-pink mottled appearance. It is commonly found in river beds as smooth pebbles or glacially deposited till in the eastern United States. Major deposits are in Virginia, North Carolina, South Africa, and Brazil.

Identified on: 4/30/2026

Mode: Standard