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Mineralpedia Details for Epidote

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Epidote

Epidote

Named for the Greek words epiprosthetos, meaning “additionally,” and dido, meaning “to give,” I reference to the additional increase of two of the crystal sides as compared to the third. Epidote is a common mineral found in thousands of localities worldwide with a few notable occurrences that include in France, Norway, Italy, Austria, the United States, Mexico, Namibia, and Pakistan. Epidote occurs in facies of regionally metamorphosed rocks, contaminated felsic igneous rocks, contact zones of igneous and calcareous sedimentary rocks, and as an alteration product of plagioclase via saussuritization.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/epidote.pdf

Formula
Ca2Fe3+Al2(Si2O7)(SiO4)O(OH) 
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Fibrous, Massive 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
yellowish green, brownish green, black, yellow, gray 
Streak
grayish white 
Class
Monoclinic - Prismatic 
Fracture
Regular 
Hardness
WebMineral
View Epidote 
Mindat
View Epidote 

Epidote variety Withamite from Glencoe, Argyllshire, Scotland

Epidote variety Withamite
            from Glencoe, Argyllshire, Scotland

Pinkish to carmine red crystal grains of this Manganese rich variety of Epidote. Though Withamite does not contain enough Mn+3 within the structure to be compositionally Piemontite, it is often called "Piemontite" because of the red coloring.

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Epidote var. Piemontite from Washoe Co., Nevada, United States

Epidote var. Piemontite
            from Washoe Co., Nevada, United States

Deep red prismatic Epidote variety Piemontite as ~1cm compact veins and encrustations with lustrous crystals lying flat on pinkish matrix. Epidote variety Piemontite, colored red by an enrichment of Mn, is not to be mistaken for the mineral Piemontite, which is a member of the Epidote group.

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Epidote from Toll Mtn. area, Jefferson Co., Montana, United States

Epidote
            from Toll Mtn. area, Jefferson Co., Montana, United States
Special Info
Chris van Laer collection

Pistachio green divergent group of slender prismatic crystals.

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Epidote from Hawthorne, Mineral Co., Nevada, United States

Epidote
            from Hawthorne, Mineral Co., Nevada, United States

Dark green, nicley terminated, well-formed crystal.

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