metamorphic
Unakite (Epidotized Granite)
Unakite (Rock composed of Epidote Ca2(Al,Fe)3(SiO4)3(OH), Orthoclase KAlSi3O8, and Quartz SiO2)
Hardness: 6 to 7 on Mohs scale; Color: Mottled green (epidote), pink (orthoclase), and gray/white (quartz); Luster: Vitreous to dull; Crystal structure: Monoclinic/Trigonal; Cleavage: None/Irregular; Specific Gravity: 2.85 to 3.20.
- Hardness
- 6 to 7 on Mohs scale
- Luster
- Vitreous to dull
Identified More metamorphic →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6 to 7 on Mohs scale; Color: Mottled green (epidote), pink (orthoclase), and gray/white (quartz); Luster: Vitreous to dull; Crystal structure: Monoclinic/Trigonal; Cleavage: None/Irregular; Specific Gravity: 2.85 to 3.20.
Formation & geological history
Formed through hydrothermal metamorphism of granite where plagioclase feldspar is replaced by epidote. Usually associated with Precambrian or Paleozoic geological environments.
Uses & applications
Primarily used as a lapidary stone for cabochons, beads, and carvings. Also used as an architectural stone, decorative gravel, and as a popular stone for chakra healing and crystal collecting.
Geological facts
First discovered in the Unaka Range of the Appalachian Mountains in the United States, from which it derives its name. It is the state rock of Virginia.
Field identification & locations
Identify in the field by its distinct 'pistachio' green and salmon-pink mottled appearance. Common locations include the Blue Ridge Mountains (USA), South Africa, Sierra Leone, and Brazil. It is easily recognized by its coarse-grained texture and unique color contrast.
More like this
