Epidote thin section

  • Before-Epidote #1
    After-Epidote #1
    N //Epidote #1N +
  • Before-Epidote #2
    After-Epidote #2
    N //Epidote #2N +
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General

Formula: [Ca2][Al2Fe3+](Si2O7)(SiO4)O(OH)

Crystal system: Monoclinic

Distinguishing features

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N // (PPL)

Color: yellow or greenish-yellow

Pleochrosim: colourless to yellow

Relief: strong

Cleavage: perfect after {001}

N + (XPL)

Isotropy/Anisotropy: anisotropic

Interference color: II-III (very bright or ‘fluorescent’)

Extinction angle: parallel / 0° to length of elongate crystals and inclined extinction relative to its {001} cleavage

Twins:

Uniaxial/biaxial: Biaxial (-)

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