mineral
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
AI-generated identification · may be incorrectHardness: 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
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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: 3.3-3.6
Formation & geological history
Formed through low-to-medium grade regional metamorphism of igneous and sedimentary rocks, or through hydrothermal alteration of calcium-rich minerals. Often found in schists, gneisses, and skarns.
Uses & applications
Primarily used as a minor gemstone for jewelry when transparent, and highly valued as a collector's specimen. It serves as an indicator mineral for metamorphic grade in geological studies.
Geological facts
The name 'Epidote' comes from the Greek word 'epidosis', meaning 'addition', referring to the unequal sides of the crystal base. It is the most common member of the epidote group.
Field identification & locations
Identify by its distinctive 'pistachio' green color and hardness. Can be found globally, with notable deposits in the Alps, Norway, and the United States (Alaska/California). Look for green veins in metamorphic outcrops.
