mineral
Epidote
Epidote (Ca2(Al, Fe)3(SiO4)3(OH))
AI-generated identification · may be incorrectMohs hardness of 6 to 7, distinct pistachio green to yellowish-green or black color, vitreous luster, monoclinic crystal system, perfect cleavage in one direction, specific gravity around 3.3 to 3.5.
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Physical properties
Mohs hardness of 6 to 7, distinct pistachio green to yellowish-green or black color, vitreous luster, monoclinic crystal system, perfect cleavage in one direction, specific gravity around 3.3 to 3.5.
Formation & geological history
Forms primarily through regional and contact metamorphism of igneous rocks rich in calcium and iron, such as basalt and gabbro, as well as in hydrothermal veins and skarns.
Uses & applications
Used primarily as a mineral specimen for collectors and occasionally cut into cabochons or beads for jewelry.
Geological facts
The name epidote comes from the Greek word for 'increase', referring to the base of its crystal prism being longer than the other. It is a key index mineral in greenstone facies metamorphic rocks.
Field identification & locations
Easily identified by its characteristic pistachio-green color and monoclinic prismatic habit, commonly found in metamorphic terranes worldwide, particularly in Austria, France, Norway, and the USA.
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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