metamorphic
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
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 to 3.5.
- Hardness
- 6-7 Mohs
- Color
- Pistachio-green to yellowish-green
- Luster
- Vitreous to pearly
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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 to 3.5.
Formation & geological history
Formed through low-grade regional or hydrothermal metamorphism of mafic rocks, such as basalt or gabbro, and sometimes within marble or skarn deposits.
Uses & applications
Primarily used as a minor gemstone for jewelry when transparent, a decorative stone, and a collectible mineral specimen for geological study.
Geological facts
Epidote is known for its distinct 'pistachio' green color. Its name comes from the Greek word 'epidosis', meaning 'addition', in reference to one side of the ideal prism being longer than the other.
Field identification & locations
Identify by its unique yellowish-green color and hardness. It is commonly found in metamorphic rocks alongside quartz, feldspar, and chlorite. Frequent locations include the Alps, Norway, and various regions in the USA.
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