metamorphic
Epidotite
Epidotite (Epidote content > 50%)
Hardness: 6-7 Mohs; Color: Pistachio-green to yellowish-green; Luster: Vitreous to pearly; Crystal structure: Monoclinic; Cleavage: Perfect in one direction; Specific gravity: 3.3-3.6
- Hardness
- 6-7 Mohs
- Color
- Pistachio-green to yellowish-green
- Luster
- Vitreous to pearly
Identified More metamorphic →
Explore Epidotite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6-7 Mohs; Color: Pistachio-green to yellowish-green; Luster: Vitreous to pearly; Crystal structure: Monoclinic; Cleavage: Perfect in one direction; Specific gravity: 3.3-3.6
Formation & geological history
Formed through the regional or hydrothermal metamorphism of mafic igneous rocks (like basalt) or calcium-rich sediments. It typically develops in low to medium-grade metamorphic facies like the greenschist facies.
Uses & applications
Mostly used as decorative stone, for cabochons in jewelry, and as a component in aggregate for construction. It is also a significant specimen for collectors studying metamorphic sequences.
Geological facts
The characteristic pistachio-green color is diagnostic and caused by the presence of iron. It is often found associated with quartz, chlorite, and calcite.
Field identification & locations
Identify in the field by its distinct 'pistachio' green color and high hardness (will scratch glass). Commonly found in the Alps, Ural Mountains, and parts of the United States like New England and North Carolina.
More like this
