Talc thin section

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

Formula: Mg3Si4O10(OH)2

Crystal system: Triclinic

Distinguishing features

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N // (PPL)

Color: colorless

Pleochrosim:

Relief: low to moderate

Cleavage: very good in one direction {001}; in basal sections (z-axis) have no cleavage

N + (XPL)

Isotropy/Anisotropy: anisotropic

Interference color: II-III

Extinction angle: parallel / 0-3°

Twins:

Uniaxial/biaxial: Biaxial (-)

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