Anthophyllite thin section

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

Formula: ▯Mg2Mg5Si8O22(OH)2

Crystal system: Monoclinic

Distinguishing features

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N // (PPL)

Color: colourless, pale brown

Pleochrosim: weak

Relief: high

Cleavage: characteristic in 2 directions {110}; the clivage angle in two directions are at ≈ 56° and 124° in cross section, and in one direction for longitudinal section

N + (XPL)

Isotropy/Anisotropy: anisotropic

Interference color: II

Extinction angle: parallel / 0° / straight

Twins: simple and lamellar twins on {100}

Uniaxial/biaxial: Biaxial (+) and (-)

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