Cordierite thin section

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

Formula: Mg2Al3(AlSi5)O18

Crystal system: Trigonal

Distinguishing features

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N // (PPL)

Color: colourless, gray

Pleochrosim: none; sometimes weak

Relief: low

Cleavage: fair cleavage on {010}; poor on {100} and {001}

N + (XPL)

Isotropy/Anisotropy: anisotropic

Interference color: I

Extinction angle: parallel / 0° / straight

Twins: complex twinning – lamellar and cyclic twins are common

Uniaxial/biaxial: Uniaxial (+) and (-)

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