Calcedony thin section

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

Formula: !SiO2

Crystal system: Trigonal (Quartz) + Monoclinic (Moganite)

Distinguishing features

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N // (PPL)

Color: colorless

Pleochrosim:

Relief: weak – absent

Cleavage:

N + (XPL)

Isotropy/Anisotropy: anisotropic

Interference color: I

Extinction angle:

Twins:

Uniaxial/biaxial: Uniaxial (+)

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