Tourmaline thin section

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

Formula: (Na,Ca)(Mg,Li,Al,Fe2+)3Al6 (BO3)3Si6O18(OH)4

Crystal system: Trigonal

Distinguishing features

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N // (PPL)

Color: yellow, browns, blue, red, green, black

Pleochrosim: intense

Relief: strong

Cleavage: poor after {110} and {101}

N + (XPL)

Isotropy/Anisotropy: anisotropic

Interference color: II

Extinction angle: parallel / 0° in longitudial sections

Twins:

Uniaxial/biaxial: Uniaxial (-)

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