Unakite

Physical Properties

Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and gray/clear; Luster: Vitreous to dull; Crystal structure: Monoclinic (Epidote) and Triclinic (Feldspar); Cleavage: Distinct in feldspar, uneven fracture; Specific gravity: 2.85-3.20.

Formation & Geological History

Formed through the hydrothermal alteration of granite. As hot fluids circulate through granite, the plagioclase feldspar is replaced by epidote, while the orthoclase feldspar (pink) and quartz (clear/gray) remain. Typically Proterozoic in age.

Uses & Applications

Used primarily as decorative stone, architectural facing, semi-precious gemstones for jewelry (cabochons, beads), and for carvings/sculptures. It is also a popular stone for lapidary tumbling.

Geological Facts

Unakite was first discovered in the Unaka Range of North Carolina, USA, which is where it gets its name. It is the state rock of Virginia.

Field Identification & Locations

Identify in the field by its distinct 'pistachio' green and salmon-pink mottled appearance. It is commonly found in riverbeds and on beaches in the Blue Ridge Mountains of the USA and along the shores of Lake Superior as glacial drift.

Identified on: 4/25/2026

Mode: Standard