mineral
Epidote
Epidote (Ca2(Al, Fe)3(SiO4)3(OH))
Hardness of 6-7 on the Mohs scale, typically pistachio-green, yellowish-green, or nearly black in color, vitreous to resinous luster, monoclinic crystal system, good cleavage in one direction, specific gravity around 3.3-3.5.
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Physical properties
Hardness of 6-7 on the Mohs scale, typically pistachio-green, yellowish-green, or nearly black in color, vitreous to resinous luster, monoclinic crystal system, good cleavage in one direction, specific gravity around 3.3-3.5.
Formation & geological history
Forms mainly through metasomatism and regional metamorphism of rocks such as limestone and igneous rocks rich in calcium and iron; also found in hydrothermal veins.
Uses & applications
Used as a minor gemstone, carved into ornamental objects, and collected by mineral enthusiasts.
Geological facts
Epidote is the name-giving mineral of the epidote group and is commonly found in metamorphic terranes worldwide. Its characteristic pistachio-green color makes it easily recognizable to geologists.
Field identification & locations
Can be identified in the field by its distinct yellowish-green or pistachio-green color, prismatic crystal habits, and occurrence in low-grade metamorphic rocks, skarns, and hydrothermal veins. Common locations include Austria, Pakistan, and the USA.
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