Andalusite thin section

  • Before-Andalusite #1
    After-Andalusite #1
    N //Andalusite #1N +
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General

Formula: Al2SiO5

Crystal system: Orthorhombic

Distinguishing features

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N // (PPL)

Color: usually colorless; can be pink, pinkish brown, violet or gray

Pleochrosim: usually is absent but when is colored show weak pleochroism usually pink to colorless, others colors are green and yellow

Relief: strong

Cleavage: can show two {110} cleavages intersecting at ~90°

N + (XPL)

Isotropy/Anisotropy: anisotropic

Interference color: I

Extinction angle: parallel / 0°; in basal sections it is symmetrical

Twins: absent

Uniaxial/biaxial: Biaxial (-)

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