mineral
Epidote
Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
AI-generated identification · may be incorrectHardness: 6-7 Mohs; Color: Pistachio-green, yellow-green, or brownish-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, yellow-green, or brownish-green
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-7 Mohs; Color: Pistachio-green, yellow-green, or brownish-green; Luster: Vitreous to pearly; Crystal Structure: Monoclinic; Cleavage: Perfect in one direction; Specific Gravity: 3.3-3.6
Formation & geological history
Forms through regional metamorphism of calcium-rich igneous rocks or hydrothermal alteration. Commonly found in schists, gneisses, and skarns.
Uses & applications
Primarily a collector's mineral; sometimes used as a minor gemstone (Pistacite) or for decorative beads and carvings.
Geological facts
Epidote is named from the Greek word 'epidosis' meaning 'addition' because one side of the ideal prism is longer than the others. It is a key indicator mineral in low-grade metamorphism.
Field identification & locations
Identify in the field by its characteristic 'pistachio green' color and high hardness. Common in mountainous regions with metamorphic history like the Alps or Blue Ridge Mountains.
