metamorphic
Unakite
Altered Granite (Granitic Metamorphic Rock)
Hardness of 6-7 on the Mohs scale; mottled green, pink, and white/grey coloration; sub-vitreous to waxy luster; granular crystal structure; specific gravity around 2.6 - 3.0.
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Physical properties
Hardness of 6-7 on the Mohs scale; mottled green, pink, and white/grey coloration; sub-vitreous to waxy luster; granular crystal structure; specific gravity around 2.6 - 3.0.
Formation & geological history
Formed through hydrothermal alteration of granite, where plagioclase feldspar is replaced by epidote, commonly found in granitic environments and glacial drift.
Uses & applications
Used primarily for making cabochons, beads, small decorative carvings, and polished display stones in lapidary arts.
Geological facts
Unakite was first discovered in the Unaka Mountains of western North Carolina, from which it derives its name. It is essentially a granite composed of pink orthoclase feldspar, clear quartz, and green epidote.
Field identification & locations
Easily identified by its distinct combination of salmon-pink and pistachio-green patches. Commonly found in riverbeds, glacial tills, and mountainous regions associated with granite intrusions.
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