Spodumene thin section

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

Formula: LiAlSi2O6

Crystal system: Monoclinic

Distinguishing features

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N // (PPL)

Color: colourless; rare green

Pleochrosim: none to weak

Relief: moderate

Cleavage: good in two directions {110} – the clivage angle in two directions are at nearly right angles ≈ 87° and 93° in cross section, and in one direction for longitudinal section

N + (XPL)

Isotropy/Anisotropy: anisotropic

Interference color: I-II

Extinction angle: 10-27°

Twins:

Uniaxial/biaxial: Biaxial (+)

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