pleochroism


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Related to pleochroism: birefringence

ple·o·chro·ma·tism

(plē'ō-krō'mă-tizm),
Property of showing changes of color when illuminated along different axes, as in certain crystals or liquids.
Synonym(s): pleochroism
[pleo- + G. chrōma, color]

pleochroism

(plē-ŏk′rō-ĭzm) [″ + ″ + -ismos, condition]
The property of a crystal that produces different colors when light passes through it at different angles.

pleochroism 

The property of an optically anisotropic medium (e.g. certain crystals) to exhibit different brightness and/or colour when the light transmitted through it is viewed from different directions. (A particular case of pleochroism is dichroism.) Syn. polychroism. See anisotropic; dichroism.
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References in periodicals archive ?
Hornblende (48%) forms heteroblastic and subidioblastic individuals, strongly fractured, of tabular-prismatic shape with intense pleochroism varying shades of green to brown.
Hornblende shows yellowish green to green and lamprobolite light brown to reddish brown pleochroism, whereas both displays well developed sets of 56deg and 124deg cleavages in basal sections.
7-1 Fiber Manipulations: Removing Fibers from Tape and Mounting 7-2 Observing Effects of Mounting Media 7-3 Observing Fiber Shape, Surface and Internal Structure 7-4 Observing Color and Pleochroism 7-5 Distinguishing Natural and Manufactured Fiber Classes
A grain mount, with a Na-gel filtered light (590 nm), shows that lafossaite is yellow-brown in plane-polarized transmitted light, isotropic, and displays no pleochroism.
482, pleochroism O = bluish with a grayish tint, E = pale bluish with a grayish tint, O [greater than or equal to] E.
708, pleochroism strong, O = pale yellow, E = yellowish orange.
638, 2V could not be measured but must be very small, dispersion could not be measured; pleochroism medium strong, X very pale bluish, Y and Z bluish with a greenish tint, Z [approximately equal to] Y [much greater than] X; orientation not given.
Optical data: In reflected light: pink sometimes with a slight grayish tint, weak anisotropism from light gray to brownish gray, no bireflectance, pleochroism not mentioned.
52[degrees]; dispersion not mentioned; pleochroism distinct, X = very pale blue, Z = pale greenish blue; X ^ a = 22[degrees] in obtuse angle [beta], Y [approximately equal to] c, Z = b.
70[degrees], dispersion not determined; pleochroism strong, X = light brown, Y = red-brown, Z = yellow; X ^ c = 15[degrees] in acute angle [beta], Y = b, Z ^ a = 40[degrees] in obtuse angle [beta].
Pleochroism is usually distinct, from medium blue to pale greenish blue.
50[degrees]; dispersion not given; strong pleochroism X = violet-red, Y = green, Z = greenish blue; Z = b, X^c = 23[degrees] (in obt use angle [beta]), Z^c = 5[degrees] (in obtuse angle [beta]).