metamorphic
Unakite (Epidotized Granite)
Epidotized Granite (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH))
Hardness: 6-7 (Mohs scale), Color: Mottled green (epidote) and pink/orange (orthoclase feldspar) with clear quartz, Luster: Vitreous to dull, Crystal Structure: Trigonal/Monoclinic, Cleavage: None/Indistinct, Specific Gravity: 2.85-3.00
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Mottled green (epidote) and pink/orange (orthoclase feldspar) with clear quartz, Luster: Vitreous to dull, Crystal Structure: Trigonal/Monoclinic, Cleavage: None/Indistinct, Specific Gravity: 2.85-3.00
Formation & geological history
Formed through hydrothermal metamorphism of granite where plagioclase feldspar is replaced by epidote. Usually associated with Precambrian or Paleozoic eras.
Uses & applications
Used primarily in jewelry as cabochons or beads, decorative carvings, architectural facing stone, and sometimes as an ornamental gemstone in landscaping.
Geological facts
Unakite was first discovered in the Unaka Range of North Carolina, USA. It is unique because it is a granite that has undergone a specific type of metamorphism to gain its green color.
Field identification & locations
Identify in the field by its distinct 'pistachio' green and 'salmon' pink mottling. It is a tough stone that takes a high polish. Common in riverbeds in the Blue Ridge Mountains.
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