Glauconite thin section

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

Formula: (K,Na)(Mg,Fe2+,Fe3+)(Fe3+,Al)(Si,Al)4O10(OH)2

Crystal system: Monoclinic

Distinguishing features

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N // (PPL)

Color: green

Pleochrosim: weak to moderate

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

Extinction angle: parallel / 0-3°

Twins:

Uniaxial/biaxial: Biaxial (-)

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