Reflected/transmitted colour: polished section in air gray to brown or blue, darker in oil, but the colours are intensified. Internal reflections are only present when Fe2+ content is strongly reduced.
Optical isotropy/anisotropy: polished section in air very strong anisotropic, blue, pink, reddish brown, 45° fiery orange, in oil slightly reduced, 45° pinkish gray
Birefringence δ/bireflectance: polished section in air very strong bireflectance, blue or blue-gray and brown or pinkish brown, in oil slightly intensified but darker colours
Optical axial plane:
|Back to Alphabetical list||Colour photos||Physical, chemical and crystallographic description||SEM images||TEM images||vibrational spectra description||IR spectra||Raman spectra||N-IR spectra||F-IR spectra||IES spectra|