metamorphic
Unakite
Altered Granite (Epidotized Granite)
Hardness: 6-7 on Mohs scale. Color: Mottled green, pink, and white/gray. Luster: Vitreous to dull. Crystal structure: Typically massive or granular, composed of intergrown minerals. Cleavage: Indistinct. Specific gravity: 2.5-3.0.
- Hardness
- 6-7 on Mohs scale
- Color
- Mottled green, pink, and white/gray
- Luster
- Vitreous to dull
Identified More metamorphic →
Explore Unakite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6-7 on Mohs scale. Color: Mottled green, pink, and white/gray. Luster: Vitreous to dull. Crystal structure: Typically massive or granular, composed of intergrown minerals. Cleavage: Indistinct. Specific gravity: 2.5-3.0.
Formation & geological history
Formed through the hydrothermal alteration (metasomatism) of granite, where original plagioclase feldspar is replaced by epidote, green chlorite, and pink orthoclase feldspar. Geological age varies widely depending on the region of formation.
Uses & applications
Frequently used as a decorative stone, tumbled stone for metaphysical and ornamental purposes, carved into small objects, and occasionally cut into cabochons for jewelry.
Geological facts
Unakite was first discovered in the Unaka Mountains of western North Carolina, from which it derives its name. It often contains quartz grains mixed with pink orthoclase and green epidote.
Field identification & locations
Easily identified visually by its distinctive pink and pistachio-green color combination. Commonly found in glacial drift derived from granitic terranes, such as the Blue Ridge Mountains in the US and various European localities.
More like this
