metamorphic
Epidote
Epidote (Ca2(Al, Fe)3(SiO4)3(OH))
Hardness: 6-7 on Mohs scale. Color: Pistachio-green to yellowish-green. Luster: Vitreous to pearly. Crystal structure: Monoclinic. Cleavage: Perfect in one direction.
- Hardness
- 6-7 on Mohs scale
- Color
- Pistachio-green to yellowish-green
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Pistachio-green to yellowish-green. Luster: Vitreous to pearly. Crystal structure: Monoclinic. Cleavage: Perfect in one direction.
Formation & geological history
Formed through regional or contact metamorphism of calcium-rich rocks like basalt, gabbro, or limestone. Often found in hydrothermal veins and vugs.
Uses & applications
Used primarily as a collector specimen and occasionally as a minor gemstone or ornamental stone when found in large, clear crystals.
Geological facts
The name comes from the Greek word 'epidosis' meaning 'addition', referring to the crystal's geometry. Its characteristic pistachio green color is highly diagnostic.
Field identification & locations
Identify in the field by its distinct green color and hardness (it can scratch glass). Found globally, notably in the Austrian Alps, Norway, and various locations across the USA.
