Unakite

Physical Properties

Hardness: 6.0-7.0 (Mohs scale); Color: Mottled green (epidote), pink (orthoclase), and colorless/grey (quartz); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic mixture; Cleavage: None/Indistinct; Specific gravity: 2.85-3.20.

Formation & Geological History

Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Usually associated with metasomatic processes in deep continental crust.

Uses & Applications

Commonly used for lapidary work including beads, cabochons, and small carvings. It is also used as an architectural stone for countertops and floor tiles.

Geological Facts

Unakite was first discovered in the Unaka Range of North Carolina, USA. It is unique because it combines three distinct minerals into a single, cohesive rock with a striking color contrast.

Field Identification & Locations

Identify in the field by its distinct 'pistachio and ham' color combination. It is frequently found as river pebbles in areas with metamorphic basement rock, particularly in the Appalachian Mountains and the Great Lakes region.

Identified on: 4/18/2026

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