metamorphic
Unakite
Altered Granite (Granitic Metamorphic Rock)
AI-generated identification · may be incorrectHardness of 6-7 on the Mohs scale, with distinct mottled green, pink, and brown colors. Exhibits a vitreous to dull luster and a compact, massive crystal structure with no notable cleavage.
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Physical properties
Hardness of 6-7 on the Mohs scale, with distinct mottled green, pink, and brown colors. Exhibits a vitreous to dull luster and a compact, massive crystal structure with no notable cleavage.
Formation & geological history
Formed through the hydrothermal alteration or metasomatism of granitic rocks, where orthoclase feldspar and quartz are altered by heated groundwater, typically during mountain-building events.
Uses & applications
Used primarily in lapidary work, carved into decorative objects, tumbled for polished stones, and fashioned into cabochons for jewelry.
Geological facts
First discovered in the Unaka Mountains of North Carolina, from which it derives its name. The green coloration is primarily due to altered epidote within the rock matrix.
Field identification & locations
Easily identified in the field by its distinct patchy combination of pink feldspar, clear quartz, and green epidote. Commonly found in glacial drift derived from granitic terranes.
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