Staurolite thin section

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

Formula: Fe22+Al9Si4O23(OH)

Crystal system: Monoclinic

Distinguishing features

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N // (PPL)

Color: colourless to yellow

Pleochrosim: weak to moderate in honey yellow

Relief: high

Cleavage: weak cleavage trace

N + (XPL)

Isotropy/Anisotropy: anisotropic

Interference color: I (up to pale golden yellow)

Extinction angle:

Twins: can show twins oriented at 60° or 90°

Uniaxial/biaxial: Biaxial (+)

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