Mineralpedia Details for 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
- Crystal System
- Crystal Habit
- Prismatic, Fibrous, Massive
- Perfect, None, None
- Vitreous (Glassy)
- yellowish green, brownish green, black, yellow, gray
- grayish white
- Monoclinic - Prismatic
- View Epidote
- View Epidote
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.
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.
Epidote from Toll Mtn. area, Jefferson Co., Montana, United States
- Special Info
- Chris van Laer collection
Pistachio green divergent group of slender prismatic crystals.
Epidote from Hawthorne, Mineral Co., Nevada, United States
Dark green, nicley terminated, well-formed crystal.