Epidote-bearing Granite (Unakite-like)

Physical Properties

Hardness: 6-7 (Mohs scale); Color: Mottled green (epidote), pink/tan (feldspar), and grey (quartz); Luster: Vitreous to dull; Crystal structure: Phaneritic (coarsegrained) igneous texture; Cleavage: Good in feldspar grains, none in quartz.

Formation & Geological History

Formed through the hydrothermal alteration of granitic rock. As hot, mineral-rich fluids circulate through cooling granite, plagioclase feldspar is replaced by green epidote. This is often associated with mountain-building proccesses.

Uses & Applications

Commonly used as a decorative stone, in lapidary work for cabochons and beads, and as architectural facing or floor tiles. Polished specimens are popular for metaphysical collecting.

Geological Facts

When this specific combination of pink orthoclase, green epidote, and quartz occurs in a balanced aesthetic, it is often referred to as 'Unakite', named after the Unaka Range in the United States where it was first described.

Field Identification & Locations

Identify in the field by its distinct mottled pink and moss-green appearance. It is much harder than similar-looking sedimentary rocks and will not react to acid. Commonly found in riverbeds or glacial tills in regions with granitic bedrock.

Identified on: 4/25/2026

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