Unakite

Physical Properties

Hardness: 6-7 (Mohs scale); Color: Mottled green (epidote) and pink/orange (orthoclase feldspar); Luster: Dull to vitreous; Crystal Structure: Monoclinic; Cleavage: Good in two directions (feldspar component); Specific Gravity: 2.85-3.20.

Formation & Geological History

Formed through the hydrothermal alteration of granite. As hydrothermal fluids circulate through granitic rock, plagioclase feldspar is replaced by epidote, while orthoclase feldspar remains, creating the characteristic pink and green pattern. Usually found in Proterozoic or Paleozoic geological settings.

Uses & Applications

Primarily used as a semi-precious gemstone for cabochons, beads, and carvings. Also used in architectural facing and construction as decorative gravel or crushed stone.

Geological Facts

Unakite was named after the Unaka Range of the Blue Ridge Mountains in North Carolina/Tennessee where it was first discovered. It is the state rock of Virginia.

Field Identification & Locations

Identify by its distinctive combination of salmon-colored feldspar and pistachio-green epidote. It is commonly found as pebbles along riverbeds or in mountains like the Blue Ridge region of the USA, or along the shores of Lake Superior.

Identified on: 4/25/2026

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