metamorphic
Epidote in Quartz (Epidosite)
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
Hardness: 6-7 (Mohs scale); Color: pistachio-green to dark olive green; Luster: vitreous to resinous; Crystal structure: Monoclinic; Cleavage: perfect in one direction; Specific gravity: 3.3-3.6
- Hardness
- 6-7 (Mohs scale)
- Color
- pistachio-green to dark olive green
- Luster
- vitreous to resinous
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Physical properties
Hardness: 6-7 (Mohs scale); Color: pistachio-green to dark olive green; Luster: vitreous to resinous; Crystal structure: Monoclinic; Cleavage: perfect in one direction; Specific gravity: 3.3-3.6
Formation & geological history
Formed through regional or contact metamorphism of calcium-rich rocks or the hydrothermal alteration of igneous rocks usually in low-to-medium grade metamorphic facies.
Uses & applications
Primarily used as a collector specimen, semi-precious gemstone in jewelry (when high quality), and occasionally as a decorative stone in landscaping.
Geological facts
The name Epidote comes from the Greek word 'epidosis' which means 'addition', referring to the crystal's geometry. It is a common constituent of greenstone and is frequently found with quartz and feldspar.
Field identification & locations
Identify in the field by its distinct 'pistachio' green color and relatively high hardness. It is common in alpine veins and areas with hydrothermally altered basalt.
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