NOUN
- the phenomenon of different colors appearing when certain crystals are viewed from different directions
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.