mineral
Epidote
Ca2(Al, Fe)3(SiO4)3(OH)
Hardness of 6-7 on the Mohs scale, typically pistachio-green to yellowish-green or blackish-green color, vitreous luster, monoclinic crystal system, perfect 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 to yellowish-green or blackish-green color, vitreous luster, monoclinic crystal system, perfect cleavage in one direction, specific gravity around 3.3-3.5.
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
Primarily used as a mineral specimen for collectors, sometimes cut into cabochons or beads for jewelry, and occasionally carved into ornamental objects.
Geological facts
Epidote is the namesake of the epidote mineral group. Its name comes from the Greek word 'epidosis', meaning 'increase', referring to the base of its prism having one side longer than the other.
Field identification & locations
Easily identified in the field by its distinct pistachio-green color, monoclinic crystals, and association with quartz or feldspar in metamorphic and hydrothermal environments. Found worldwide, with notable localities in Austria, Pakistan, and the USA.
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Septarian Pebble
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Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
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Schist
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