metamorphic
Unakite
Epidote–orthoclase–quartz metamorphic rock
AI-generated identification · may be incorrectTypically salmon-pink orthoclase, pistachio-green epidote, and gray to translucent quartz in a mottled, granular texture; Mohs hardness about 6–7, vitreous to dull luster, with no prominent cleavage as a rock. The rounded, polished appearance indicates a tumbled specimen.
Identified More metamorphic →
Explore Unakite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Typically salmon-pink orthoclase, pistachio-green epidote, and gray to translucent quartz in a mottled, granular texture; Mohs hardness about 6–7, vitreous to dull luster, with no prominent cleavage as a rock. The rounded, polished appearance indicates a tumbled specimen.
Formation & geological history
Forms when granite undergoes hydrothermal alteration or low-grade metamorphism, replacing feldspar with epidote while quartz remains; it is generally Precambrian to Paleozoic in source age. Commonly found in altered granitic terrains, especially the Appalachian region of the United States.
Uses & applications
Used as a decorative stone, tumbled stone, cabochon, beads, carvings, and inexpensive jewelry; occasionally used for ornamental facing and lapidary work.
Geological facts
The characteristic pink-and-green pattern results from the contrasting feldspar and epidote minerals rather than dye. Unakite is named after the Unaka Mountains of North Carolina and Tennessee.
Field identification & locations
Identify it by its distinctive mottled salmon-pink, green, and gray colors, granular texture, and hardness; it should not show uniform banding or glassy bubbles. Comparable material occurs in Brazil, South Africa, China, and the United States.
More like this
