Unakite

Physical Properties

Hardness: 6-7 (Mohs scale); Color: Mottled green (epidote), pink (orthoclase feldspar), and clear/grey (quartz); Luster: Vitreous to dull; Crystal structure: Massive/Granular; Specific Gravity: 2.85-3.20.

Formation & Geological History

Formed through the hydrothermal metamorphism of granite. Hot fluids containing dissolved minerals chemically alter original granite, replacing pyroxene or biotite with green epidote. Most common in Precambrian or Paleozoic terrains.

Uses & Applications

Used primarily as a decorative stone, for cabochons in jewelry, architectural accents, tiles, and as a popular lapidary material for carvings and spheres.

Geological Facts

It is the state rock of Virginia, USA. It was first discovered in the Unaka Mountains of North Carolina/Tennessee, from which it gets its name. It is often found as stream-tumbled pebbles on the shores of Lake Superior.

Field Identification & Locations

Identify by its distinctive 'pistachio and ham' appearance (mottled green and pink). Look for it in riverbeds downstream from granitic mountain ranges or on glacial beaches. It takes a high polish, making it a favorite for tumbling.

Identified on: 4/21/2026

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