metamorphic
Unakite
Altered Granite (composed of orthoclase feldspar, epidote, and quartz)
Hardness of 6-7 on the Mohs scale, mottled green and pink/orange-brown coloration, vitreous to dull luster, massive or granular crystal structure, no distinct 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/orange-brown coloration, vitreous to dull luster, massive or granular crystal structure, no distinct cleavage, specific gravity around 2.6-3.0.
Formation & geological history
Formed by the hydrothermal alteration of granitic rocks, where plagioclase feldspar is replaced by epidote. Often found in glacial drift or river pebbles originating from granitic mountain ranges.
Uses & applications
Used primarily as a decorative stone for cabochons, beads, carved spheres, tumbled stones, and occasionally architectural tiles.
Geological facts
Unakite was first discovered in the Unaka Mountains of western North Carolina, from which it derives its name. The distinct pink and green color combination makes it a popular stone among lapidaries and amateur rockhounds.
Field identification & locations
Easily identified in the field by its distinct, colorful mottling of pistachio-green epidote and pink-to-orange orthoclase feldspar. Commonly found in stream beds and glacial deposits derived from granitic terranes.
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