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, typically prismatic crystals; Cleavage: Perfect in one direction; Specific gravity: 3.3-3.5
- Hardness
- 6-7 on Mohs scale
- Color
- Pistachio-green, yellowish-green, or blackish-green
- Luster
- Vitreous to resinous
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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, typically prismatic crystals; Cleavage: Perfect in one direction; Specific gravity: 3.3-3.5
Formation & geological history
Forms primarily through regional and contact metamorphism of igneous rocks rich in calcium and iron, as well as in hydrothermal veins and skarns.
Uses & applications
Used primarily as mineral collector specimens and occasionally cut into cabochons or beads for jewelry.
Geological facts
The name epidote comes from a Greek word meaning 'increase,' referring to the base of its crystal prism having one side longer than the other. Fine crystals are highly prized by mineral collectors worldwide.
Field identification & locations
Easily identified in the field by its characteristic pistachio-green color and monoclinic crystal habits. Commonly found in locations such as the Alps, Pakistan, Austria, and various localities in the USA.
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