metamorphic
Epidote with quartz/feldspar
Epidote, Ca2(Al,Fe)3(SiO4)3(OH)
Hardness: 6-7. Color: Yellow-green to pistachio green. Luster: Vitreous to resinous. Crystal structure: Monoclinic, often massive or granular in this form. Cleavage: Perfect on {001}. Specific gravity: 3.3-3.6.
- Hardness
- 6-7
- Color
- Yellow-green to pistachio green
- Luster
- Vitreous to resinous
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Physical properties
Hardness: 6-7. Color: Yellow-green to pistachio green. Luster: Vitreous to resinous. Crystal structure: Monoclinic, often massive or granular in this form. Cleavage: Perfect on {001}. Specific gravity: 3.3-3.6.
Formation & geological history
Formed by regional or contact metamorphism of calcium-rich rocks like limestone or calcareous shale. Also found as a hydrothermal alteration product in igneous rocks.
Uses & applications
A common mineral used as an indicator of metamorphic grade. High-quality crystals can be faceted for collectors, but massive forms are mostly for mineral collections.
Geological facts
The characteristic 'pistachio' green color is a key identifier for epidote. It gives its name to the epidote group of minerals.
Field identification & locations
Identify by its distinct yellow-green color and hardness. Often found in metamorphic terrains associated with other calcium-rich minerals. Common worldwide.
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