pleochroic


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Related to pleochroic: trichroism

ple·o·chro·mat·ic

(plē'ō-krō-mat'ik),
Relating to pleochromatism.
Synonym(s): pleochroic

pleochroic

(ple?o-kro'ik) [Gr. pleon, more, + chroia, color] Pleochromatic.
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References in periodicals archive ?
Dark green, intensively pleochroic (lightly green-yellowish to dark green or black-green) amphibole grains 0.
A few beautiful faceted gems have already been cut, and some of these show a tanzanite-like pleochroic effect, looking purple from one angle and blue-purple from another.
Rubies, sapphires and green pargasites from Hunza; rubies from Azad Kashmir; pink topaz crystals from Katlang in the Mardan district, North West Frontier Province; emeralds from Swat; peridots from the Sapat Valley in Kohistan; and the remarkable, gemmy and pleochroic lazulite crystals which probably, although not certainly, come from Laila Camp in the Gilgit district .
In transmitted plane-polarized light, it is strongly pleochroic, orange-red ||[epsilon] and purple-violet ||[omega].
5[degrees], dispersion not observed; pleochroic brown, Z > Y; X < c.
The crystals are invariably pleochroic, as are all crystals of the minerals of the epidote group.
It is pleochroic with a glassy luster, has no cleavage, a hardness of just over 2.
Crystals are pleochroic, deep blue parallel to the elongation and very pale blue normal to the elongation.
Optical data: In reflected light: pink with a lilac tinge, distinct to moderate anisotropism, weak to distinct bireflectance, pleochroic from brownish pink to pinkish lilac.
Optical data: In reflected light: gray, strong anisotropism, strong bireflectance, pleochroic in gray colors.
690(1), 2V(obs) = 89(2)[degrees], 2V(calc) = 87(5)[degrees], strongly pleochroic with X = yellow-brown, Z = dark yellow-brown, Z > X, X [conjunction] b = 20[degrees] (in [gamma] obtuse), Y [conjunction] C = 13[degrees] (in [alpha] acute), Z = a.