pleochroic
Concise Oxford English Dictionary © 2008 Oxford University Press:
pleochroic /ˌpliːə(ʊ)ˈkrəʊɪk/
▶adjective Crystallography displaying variable colours owing to differential absorption of light according to wavelength, direction, and/or polarization.
– derivatives
pleochroism noun.
pleochroism noun.
'pleochroic' also found in these Oxford entries:

