mineral

Epidote

Epidote (Ca2(Al, Fe)3(SiO4)3(OH))

Hardness: 6-7 on Mohs scale. Color: Pistachio green, yellowish-green, or blackish-green. Luster: Vitreous to resinous. Crystal structure: Monoclinic. Cleavage: Perfect in one direction.

Hardness: 6-7 on Mohs scale
Color: Pistachio green, yellowish-green, or blackish-green
Luster: Vitreous to resinous

Identified August 1, 2026More mineral →

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Physical properties

Hardness: 6-7 on Mohs scale. Color: Pistachio green, yellowish-green, or blackish-green. Luster: Vitreous to resinous. Crystal structure: Monoclinic. Cleavage: Perfect in one direction.

Formation & geological history

Forms typically through regional and contact metamorphism of igneous rocks rich in calcium and iron, as well as in hydrothermal veins.

Uses & applications

Used primarily as a mineral specimen for collectors, sometimes cut into cabochons for jewelry.

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 crystal being longer than one side.

Field identification & locations

Easily identified by its characteristic pistachio-green color and monoclinic prismatic crystals. Commonly found in association with quartz, feldspar, and various metamorphic rocks.