(of a biaxial crystal) characterized by pleochroism.

1860–65; pleo- + -chroic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pleochroism (plɪˈɒkrəʊˌɪzəm)
a property of certain crystals of absorbing light to an extent that depends on the orientation of the electric vector of the light with respect to the optic axes of the crystal. The effect occurs in uniaxial crystals (dichroism) and esp in biaxial crystals (trichroism)
[C19: pleo- + -chroism, from Greek khrōs skin colour]

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Example sentences
The cleavage fragment selected exhibited uniform optical properties and is pleochroic, green to darker green.
The two species are often easily confused when the hypersthene sections are not distinctly pleochroic.
The pyroxene and amphibole is being replaced by a specular cryptocrystalline brown or reddish-brown mineral, non-pleochroic.
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