mineral
Epidote
Calcium aluminum iron silicate (Ca2(Al, Fe)3(SiO4)3(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 calcium-rich rocks like basalt, limestone, or shale. It also occurs in hydrothermal veins and altered igneous rocks.
Uses & applications
Primarily a collector mineral and used as a minor gemstone (Unakite) in jewelry and landscaping. In industry, it can be an indicator mineral for copper and gold deposits.
Geological facts
The name comes from the Greek word 'epidosis,' meaning 'addition,' in reference to its characteristic crystal geometry being unequal in length at the base.
Field identification & locations
Identify in the field by its distinct 'pistachio green' color and hardness. Commonly found in metamorphic terrains such as the Alps and the Blue Ridge Mountains.
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Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock