metamorphic
Epidosite (Unakite-related)
Epidosite (composed primarily of Epidote and Quartz)
Hardness: 6-7 Mohs; Color: Pistachio green to yellowish-green with dark inclusions; Luster: Vitreous to pearly; Crystal structure: Monoclinic; Cleavage: Perfect in one direction; Specific gravity: 3.3-3.6
- Hardness
- 6-7 Mohs
- Color
- Pistachio green to yellowish-green with dark inclusions
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-7 Mohs; Color: Pistachio green to yellowish-green with dark inclusions; Luster: Vitreous to pearly; Crystal structure: Monoclinic; Cleavage: Perfect in one direction; Specific gravity: 3.3-3.6
Formation & geological history
Formed through hydrothermal alteration (metasomatism) of mafic rocks like basalt or gabbro, where calcium-rich minerals are replaced by epidote. Usually associated with regional metamorphism.
Uses & applications
Used primarily as a decorative stone, in lapidary work for cabochons, and as an indicator mineral for metamorphic grades in geological mapping.
Geological facts
Epidote is named from the Greek word 'epidosis' which means 'addition'. It is often found in the company of pink orthoclase feldspar, at which point the rock is specifically called Unakite.
Field identification & locations
Identifiable by its characteristic 'pistachio lime' green color and hardness. Commonly found in metamorphic terrains such as the Blue Ridge Mountains in the USA or alpine regions.
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