Unakite

Hardness: 6-7 on Mohs scale. Color: Characteristically pink (orthoclase feldspar), green (epidote), and sometimes clear or gray (quartz). Luster: Vitreous to greasy. Crystal structure: Granular, massive. No cleavage, but typically fractures irregularly. Specific Gravity: 3.2-3.5

Unakite is an altered granite composed primarily of epidote, pink orthoclase feldspar, and quartz. It forms when granite is metamorphosed and metasomatized; hydrothermal alteration changes plagioclase feldspar into epidote. The geological age of Unakite varies depending on the age of the granitic intrusion it originated from and the subsequent metamorphic events. It is often associated with orogenic belts.

Unakite is widely used as an ornamental stone. It is highly valued for cabochons, beads (as seen in the image), carvings, and other lapidary uses. It is also used in sculptures and occasionally as a facing stone.

Unakite was first discovered in the Unaka Mountains of North Carolina, which is how it received its name. It is sometimes considered a semi-precious stone and is known for its distinctive mottled coloration, making each piece unique.

In the field, Unakite can be identified by its distinctive pink and green mottled appearance. The granular texture and the presence of clearly visible pink feldspar, green epidote, and sometimes glassy quartz are key indicators. It is commonly found in the United States (North Carolina, Virginia), South Africa, Sierra Leone, Brazil, and China. When identifying Unakite, look for the characteristic color combination and feel the relatively hard, granular surface. It typically does not exhibit distinct crystal forms, appearing more as a massive rock.