Epidote Gemstone & Information | Gemopedia by JTV | Gemopedia™

Epidote

A pearly transparent to nearly opaque gemstone, Epidote often has a yellowish-green or green "pistachio" color. Small faceted stones may appear black due to the dark nature of the colors. Epidote specimens are often appreciated for their dramatic crystal displays.

Colors

Light To Very Dark Green To Brown

  • Epidote classification

    CommonName
    Epidote
    Species
    Epidote
    Variety
    Colors
    Light To Very Dark Green To Brown
    AlternateNames
    Pistacite- Yellow Green
    GemstoneGroups
    Epidote
    KeySeparations
    RI, birefringence, optic character (might show pseudo-uniaxial optic figure) and spectrum
    ClassificationComments
  • Epidote chemistry & crystallography

    ChemicalName
    calcium aluminum iron silicate
    ChemicalFormula
    Ca2(Al,Fe)3(SiO4)3(OH)
    Synthesis
    CrystalSystem
    Monoclinic
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Epidote optical properties

    Transparency
    Transparent - Translucent
    Dispersion
    Strength: strong fire Value: 0.03
    OpticalComments
    RefractiveIndex
    1.729-1.768
    Tolerance:(+0.012/-0.035)
    Birefringence
    0.019-0.045
    OpticCharacter
    Biaxial
    OpticSign
    Negative
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: inert
    LWUV: inert
    CCFReaction
    Pleochroism
    Trichroic, strong green, brown, and yellow
  • Epidote characteristic physical properties

    Hardness
    6-7
    CharacteristicComments
    Streak
    Gray
    SpecificGravity
    3.35-3.5 Typical:3.4
    Toughness
    Varies
    Inclusions
    Luster
    Vitreous
    Stability
    Fracture
    Conchoidal, Uneven
    Cleavage
    Perfect, in one direction, Good, in one direction