metamorphic
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
Hardness: 6-7, Color: Pistachio green to yellowish green, Luster: Vitreous to pearly, Crystal structure: Monoclinic, Cleavage: Perfect in one direction, Specific gravity: 3.3-3.6
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Physical properties
Hardness: 6-7, 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
Commonly forms in regionally metamorphosed rocks of low to medium grade. It frequently occurs as an alteration product of calcium-rich minerals in hydrothermal environments.
Uses & applications
Primarily of interest to mineral collectors and as a semi-precious gemstone. Sometimes used in industrial abrasive applications where hardness is required.
Geological facts
The name Epidote comes from the Greek word 'epidosis', meaning 'increase' or 'addition', referring to the unequal sides of the crystal base. It is the signature mineral of the greenschist metamorphic facies.
Field identification & locations
Identified by its distinctive yellowish 'pistachio' green color. In the field, it is often found in quartz veins or as granules in metamorphic rocks. Look for its association with chlorite and actinolite.
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