How To Use Pleochroism In A Sentence

This colour variation is pleochroism (strictly trichroism in biaxial minerals).
Iceland-spar is extensively used in the construction of Nicol's prisms for polariscopes, polarizing microscopes and saccharimeters, and of dichroscopes for testing the pleochroism of gem-stones. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"
Optically, purple apatite commonly shows slight bluish to reddish pleochroism.
These produced iolite gems with excellent transparency and pleochroism; they weighed 0.5, 1.0, and 1.49 carats.
Biotite shows the same pleochroism as in the granodiorite.

Biotite occurs as interstitial grains with strong pleochroism from light yellowish-green to dark brown.
Biotite, containing haloes, 223; pleochroism of, 235; intensified pleochroism in halo, 235. The Birth-Time of the World and Other Scientific Essays
Such an effect is called pleochroism, and crystals which show variations in their colour when viewed from different angles, or by transmitted light, are called pleochroic, or pleochromatic -- from two Greek words signifying "to colour more. The Chemistry, Properties and Tests of Precious Stones
Because of Iolite's pleochroism (it appears a different color depending on the angle of the light), they could look through the mineral to determine the sun's exact position and navigate accurately. De.lirio.us
Cordierite is often referred to as dichorite because of its strong pleochroism, which produces gemstones that appear to change shades of color, depending on the viewing angle.