metamorphic
Unakite (Epidotized Granite)
Epidote-Feldspar-Quartz Rock
Hardness: 6-7 (Mohs scale); Color: Mottled green (epidote), pink/orange (orthoclase feldspar), and gray (quartz); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic minerals; Cleavage: Uneven fracture; Specific gravity: 2.8-3.2
- Hardness
- 6-7 (Mohs scale)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green (epidote), pink/orange (orthoclase feldspar), and gray (quartz); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic minerals; Cleavage: Uneven fracture; Specific gravity: 2.8-3.2
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. These rocks are most commonly associated with Proterozoic and Paleozoic geological ages.
Uses & applications
Primarily used as a semi-precious gemstone for cabochons, beads, and carvings. Also used in architectural stone, floor tiles, and as a decorative landscaping rock.
Geological facts
Unakite takes its name from the Unaka Range in the Blue Ridge Mountains (USA). It is the state rock of Virginia. Because of its unique color combination, it is popular in 'metaphysical' gift shops.
Field identification & locations
Identify in the field by its distinct 'pistachio' green and 'salmon' pink mottled pattern. It is commonly found in river beds and lake shores (like the Great Lakes) as water-smoothed pebbles. Its hardness means it cannot be scratched by a steel knife.
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