mineral
Epidote
Ca2(Al,Fe)3(SiO4)3(OH)
AI-generated identification · may be incorrectHardness 6-7 on Mohs scale, typically pistachio-green to dark green, vitreous luster, monoclinic crystal system, and uneven fracture with distinct cleavage.
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Physical properties
Hardness 6-7 on Mohs scale, typically pistachio-green to dark green, vitreous luster, monoclinic crystal system, and uneven fracture with distinct cleavage.
Formation & geological history
Forms mainly through regional and contact metamorphism of igneous rocks rich in calcium and iron, as well as hydrothermal alteration of feldspars and other minerals.
Uses & applications
Used primarily as a specimen mineral by collectors and occasionally cut into cabochons for jewelry.
Geological facts
Epidote's characteristic pistachio-green color is diagnostic; the name comes from the Greek word for 'increase' due to the base of its crystal prism having one side longer than the other.
Field identification & locations
Identified by its unique green color and crystal habit; commonly found in metamorphic and hydrothermal environments worldwide, especially in the Austrian Alps and the US.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Limonite
FeO(OH)•nH2O
mineral
Limonite
FeO(OH)•nH2O
mineral
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Feldspar
Feldspar Group (Tectosilicate, e.g., KAlSi3O8)
mineral