mineral
Epidote
Ca2(Al,Fe)3(SiO4)3(OH)
AI-generated identification · may be incorrectHardness: 6-7 on the Mohs scale, Color: Pistachio-green, yellowish-green, or blackish-green, Luster: Vitreous to resinous, Crystal System: Monoclinic, Cleavage: Perfect in one direction, Specific Gravity: 3.3-3.5
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Physical properties
Hardness: 6-7 on the Mohs scale, Color: Pistachio-green, yellowish-green, or blackish-green, Luster: Vitreous to resinous, Crystal System: Monoclinic, Cleavage: Perfect in one direction, Specific Gravity: 3.3-3.5
Formation & geological history
Forms primarily through regional and contact metamorphism of impure calcareous rocks, and as a hydrothermal alteration product of plagioclase feldspar in igneous rocks.
Uses & applications
Used primarily as a mineral specimen for collectors, sometimes cut into cabochons or polished stones for jewelry.
Geological facts
Epidote gets its name from the Greek word 'epidosis', meaning 'increase', because the base of its prism has one side longer than the other.
Field identification & locations
Easily identified in the field by its distinct pistachio-green color and monoclinic prismatic crystals, commonly found in hydrothermal veins and altered granites.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Septarian Pebble
Septarian nodule / Concretion
sedimentary