igneous
Unakite-veined Granite / Epidotized Granite
Epidotized Granite (FeCu2Al2(Si2O7)(SiO4)(OH)2)
Hardness: 6-7 (Mohs). Color: Pink (orthoclase feldspar), Gray (quartz), and Pistachio Green (epidote). Luster: Dull to Vitreous. Crystal Structure: Phaneritic (visible grains). Cleavage: Two directions on feldspar grains.
- Hardness
- 6-7 (Mohs)
- Luster
- Dull to Vitreous
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Physical properties
Hardness: 6-7 (Mohs). Color: Pink (orthoclase feldspar), Gray (quartz), and Pistachio Green (epidote). Luster: Dull to Vitreous. Crystal Structure: Phaneritic (visible grains). Cleavage: Two directions on feldspar grains.
Formation & geological history
Formed through hydrothermal metamorphism of granite. Hot fluids circulate through cooling granite, altering plagioclase feldspar into green epidote. Most specimens date from the Proterozoic eon.
Uses & applications
Used primarily as a lapidary stone for beads, cabochons, and decorative carvings. Larger chunks are used in architectural stone and construction aggregate.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in the United States. It is considered a semi-precious gemstone when the colors are well-defined.
Field identification & locations
Identified by the distinct combination of pink potassium feldspar and green epidote. Often found as water-worn pebbles in riverbeds or glacial tills near granitic mountain ranges.
