metamorphic
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
Hardness: 6-7 on Mohs scale. Color: Pistachio green to yellowish-green. Luster: Vitreous (glassy) to resinous. Crystal structure: Monoclinic. Cleavage: Perfect in one direction.
- Hardness
- 6-7 on Mohs scale
- Color
- Pistachio green to yellowish-green
- Luster
- Vitreous (glassy) to resinous
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Pistachio green to yellowish-green. Luster: Vitreous (glassy) to resinous. Crystal structure: Monoclinic. Cleavage: Perfect in one direction.
Formation & geological history
Formed during regional or contact metamorphism of calcium-rich igneous and sedimentary rocks. Common in greenschist facies and as a hydrothermal alteration product in basalt or gabbro.
Uses & applications
Primarily used as a minor gemstone or decorative stone for collectors; can be an indicator mineral in geological mapping or mineral exploration (especially for copper deposits).
Geological facts
The name 'Epidote' comes from the Greek word 'epidosis' meaning 'addition', referring to the crystal's base being longer on one side. It is the namesake of the Epidote group of minerals.
Field identification & locations
Identified in the field by its distinct 'pistachio' green color and relatively high hardness. Often found in quartz veins or as inclusions in other minerals like Prehnite.
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