metamorphic
Epidote (Greenstone)
Calcium aluminum iron silicate hydroxide Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)
Hardness: 6-7 on Mohs scale; Color: Pistachio-green to yellowish-green; Luster: Vitreous to pearly; Crystal structure: Monoclinic; Cleavage: Perfect in one direction; Specific gravity: 3.3-3.6
- Hardness
- 6-7 on Mohs scale
- Color
- Pistachio-green to yellowish-green
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Pistachio-green to yellowish-green; Luster: Vitreous to pearly; Crystal structure: Monoclinic; Cleavage: Perfect in one direction; Specific gravity: 3.3-3.6
Formation & geological history
Formed through regional or contact metamorphism of igneous rocks like basalt or granite, and sometimes in limestone during hydrothermal alteration. Often found in Alpine veins and skarns.
Uses & applications
Primarily used as a minor gemstone for jewelry when transparent, a decorative stone in sculptures, and a high-quality mineral specimen for collectors.
Geological facts
Epidote is well known for its unique 'pistachio green' color. It is often a key component of the rock Unakite, where it pink potassium feldspar and clear quartz.
Field identification & locations
Identify in the field by its distinct green color and association with other metamorphic minerals like chlorite or garnet. Commonly found in California (USA), France, and Pakistan.
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