metamorphic
Greenish Feldspathic Rock / Epidote Granite (Unakite-type or Epidote-bearing rock)
Epidotized Metamorphic/Igneous Rock
Hardness: 6-7 on the Mohs scale; Color: Dull greenish to yellowish-green with gray and brownish areas; Luster: Dull to sub-vitreous; Texture: Fine to medium-grained, rough fracture surfaces; Cleavage: Poor to absent in bulk rock.
- Hardness
- 6-7 on the Mohs scale
- Luster
- Dull to sub-vitreous
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Physical properties
Hardness: 6-7 on the Mohs scale; Color: Dull greenish to yellowish-green with gray and brownish areas; Luster: Dull to sub-vitreous; Texture: Fine to medium-grained, rough fracture surfaces; Cleavage: Poor to absent in bulk rock.
Formation & geological history
Formed through regional or hydrothermal metamorphism of igneous rocks rich in plagioclase feldspar, where iron and calcium alteration leads to the formation of epidote or chlorite minerals. Often associated with continental collision zones.
Uses & applications
Commonly used as crushed stone, road base, decorative landscaping rock, or collected as a field specimen. Polished varieties (like unakite) are used in cabochons and lapidary arts.
Geological facts
Epidote often gives metamorphic rocks their distinctive pistachio-green color. When combined with pink orthoclase feldspar and quartz, it forms the popular gemstone material known as Unakite.
Field identification & locations
Identified by its distinctive pale olive to dull green hue, hardness capable of scratching glass, and fine-grained, crystalline texture. Found widely in metamorphic terrains globally, including the Appalachian Mountains and Scandinavian Shield.
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