metamorphic
Epidosite
Epidosite (consisting primarily of Epidote Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH) and Quartz SiO2)
Hardness: 6-7 on Mohs scale; Color: Pistachio-green to yellowish-green streaks in a grey/green matrix; Luster: Vitreous to pearly; Crystal structure: Monoclinic; Cleavage: Perfect in one direction; Specific gravity: 3.3-3.6
- Hardness
- 6-7 on Mohs scale
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Pistachio-green to yellowish-green streaks in a grey/green matrix; Luster: Vitreous to pearly; Crystal structure: Monoclinic; Cleavage: Perfect in one direction; Specific gravity: 3.3-3.6
Formation & geological history
Formed via hydrothermal alteration (metasomatism) of mafic igneous rocks like basalt or diabase, often found in ophiolite complexes and ocean floor fracture zones.
Uses & applications
Used primarily as a decorative stone, for cabochons in jewelry, and as an indicator mineral for geologists studying hydrothermal systems and ore deposits.
Geological facts
Epidosite is essentially a hydrothermally altered basalt where the original minerals have been replaced by epidote and quartz. It is often found associated with 'Black Smoker' hydrothermal vents on the ocean floor.
Field identification & locations
Identified by its distinctive 'pistachio green' color and hardness (scratching glass). Commonly found in areas of past volcanic activity and metamorphic terranes like the Blue Ridge Mountains or the Alps.
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