metamorphic
Epidote in Matrix (likely Amphibolite or Gneiss)
Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)) in Metamorphic Matrix
Hardness: 6-7 on Mohs scale; Color: Distinctive pistachio-green or yellowish-green; Luster: Vitreous to resinous; Crystal structure: Monoclinic; Cleavage: Perfect in one direction.
- Hardness
- 6-7 on Mohs scale
- Color
- Distinctive pistachio-green or yellowish-green
- Luster
- Vitreous to resinous
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Distinctive pistachio-green or yellowish-green; Luster: Vitreous to resinous; Crystal structure: Monoclinic; Cleavage: Perfect in one direction.
Formation & geological history
Formed through regional or contact metamorphism of calcium-rich rocks. Often occurs in hydrothermal environments where basalt or gabbro is altered by mineral-rich fluids.
Uses & applications
Used primarily as a collector specimen and sometimes as a minor gemstone (unakite when mixed with pink feldspar). It serves as an indicator mineral for metamorphic grades in geology.
Geological facts
Epidote is named from the Greek word 'epidosis', meaning 'addition', referring to its crystal geometry. It is a common constituent in 'greenschist' facies rocks.
Field identification & locations
Identify in the field by its unique 'pistachio' green color against darker minerals like black hornblende or white quartz. Common in alpine veins and metamorphic terrains.
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