metamorphic
Epidote with Quartz and Feldspar
Ca2(Al2,Fe3+)(SiO4)3(OH) (Epidote complex)
Hardness: 6-7 on Mohs scale; Color: Pistachio green to dark green with inclusions of white quartz and reddish-brown feldspar; 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 dark green with inclusions of white quartz and reddish-brown feldspar; Luster: Vitreous to pearly; Crystal structure: Monoclinic; Cleavage: Perfect in one direction; Specific gravity: 3.3-3.6
Formation & geological history
Formed through low-grade regional or hydrothermal metamorphism of mafic rocks or limestone. Often found in association with alpine-type veins and skarn deposits. Geologically, these can range from the Proterozoic to Eocene eras.
Uses & applications
Commonly used as a decorative stone, in lapidary work for cabochons/beads, and as a collector's mineral specimen. Rare transparent varieties may be faceted as gemstones.
Geological facts
The name 'Epidote' comes from the Greek word 'epidosis', meaning 'addition', referring to the unequal sides of the crystal prism. Its distinct 'pistachio green' color is the most diagnostic feature for geologists.
Field identification & locations
Identify in the field by the characteristic dull green color ('pistachio') and its association with metamorphic terrains. Commonly found in California (USA), Brazil, and the Alps. To identify, check hardness (it will scratch glass but not quartz) and look for the unique green hue against lighter minerals.
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