metamorphic
Unakite
Granitic Unakite (Alteration rock composed of pink orthoclase feldspar, green epidote, and clear quartz)
Hardness of 6-7 on the Mohs scale, mottled green and pink color, vitreous to dull luster, granular crystal structure, poor cleavage, specific gravity around 2.6-3.0.
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Physical properties
Hardness of 6-7 on the Mohs scale, mottled green and pink color, vitreous to dull luster, granular crystal structure, poor cleavage, specific gravity around 2.6-3.0.
Formation & geological history
Formed by the hydrothermal alteration (metasomatism) of granite, where hot fluids alter the original minerals (plagioclase feldspar is replaced by epidote). Found globally, often in glacial drift or river pebbles eroded from granitic mountain ranges.
Uses & applications
Used primarily as a decorative stone for cabochons, beads, spheres, tumbled stones, and architectural tiles.
Geological facts
Unakite was first discovered in the Unakas Mountains of North Carolina, from which it derives its name. It is sometimes referred to as epidotized granite.
Field identification & locations
Easily identified in the field by its distinct, striking color combination of pistachio green and salmon pink. Common locations include the Blue Ridge Mountains in the US, South Africa, Brazil, and China.
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