mineral
Epidote-bearing Rock / Epidote Inclusion
Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) in host rock
Hardness of 6-7 on the Mohs scale, characteristic pistachio-green to yellowish-green 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, characteristic pistachio-green to yellowish-green color, vitreous to resinous luster, monoclinic crystal system, good cleavage in one direction, specific gravity around 3.3-3.5.
Formation & geological history
Formed through regional and contact metamorphism of lime-rich sedimentary rocks, as well as through hydrothermal alteration of igneous rocks like basalt and granite.
Uses & applications
Mostly collected by mineral enthusiasts and lapidary artists for cabochons or decorative items; not a primary industrial ore.
Geological facts
Epidote is the primary mineral responsible for the greenish tint in unakite. The name comes from the Greek word 'epidosis', meaning 'increase', referring to the crystal's base having one side longer than the other.
Field identification & locations
Easily identified by its distinctive pistachio-green or yellow-green color occurring in patches, veins, or crystals within a darker host matrix. Commonly found in metamorphic terrains worldwide.
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