1) Dichroism 2) Trichroism
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https://www.crosswordclues.com/clue/pleochroism
1) Optical phenomenon
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https://www.crosswordclues.com/clue/pleochroism
Pleochroism is an optical phenomenon in which a substance appears to be different colors when observed at different angles, especially with polarized light. == Background == Anisotropic crystals will have optical properties that vary with the direction of light. The polarization of light determines the direction of the electric field, and crystals...
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http://en.wikipedia.org/wiki/Pleochroism
the appearance of more than one color (usually when viewed with a dichroscope) as a function of the crystallographic direction from which one is viewing a gem. It is caused by the selective absorption of the ordinary and extraordinary rays in uniaxial gems (dichroism) and, in biaxial gems, by the selective absorption in the 3 principal vibrational...
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http://gemologyproject.com/wiki/index.php?title=Glossary_of_Terms
• (n.) The property possessed by some crystals, of showing different colors when viewed in the direction of different axes.
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http://thinkexist.com/dictionary/meaning/pleochroism/
The property of most doubly refractive colored gemstones of exhibiting either two or more different colors when observed through a dichroscope in transmitted light.
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http://www.agt-gems.com/Book/Glossary/
(from Greek plein, `more,` and chrs, `colour`), in optics, the selective absorption in crystals of light vibrating in different planes. Pleochroism ... [3 related articles]
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http://www.britannica.com/eb/a-z/p/80
<microscopy> The phenomenon of a substance showing different absorption colours in different vibration directions of polarized light. The observed colours change with the orientation of the crystal and can be seen only with plane polarized light, i.e., a single polar. ... (05 Aug 1998) ...
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http://www.encyclo.co.uk/local/20973
Change of colors observed in double-refractive gemstoneswhen viewed different directions. Selective absorption andvarying transmission rates of light cause the color change whenthe gemstone is viewed along different optical axes.
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http://www.encyclo.co.uk/local/22148
The effect present in a mineral exhibiting two or more separate colors when viewed at different angles. Pleochroism and dichroism are synonymous, except dichroism refers only to two colors, but pleochroism can be more than two. Minerals displaying this characteristic are said to be pleochroic.
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http://www.encyclo.co.uk/local/22291
Ple·och'ro·ism noun [ Greek ... mor... + ... color.]
(Crystallog.) The property possessed by some crystals, of showing different colors when viewed in the direction of different axes.
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http://www.encyclo.co.uk/webster/P/106
Type: Term Pronunciation: plē-ok′rō-izm Synonyms: pleochromatism
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http://www.medilexicon.com/medicaldictionary.php?t=69646
[
n] - the phenomenon of different colors appearing when certain crystals are viewed from different directions
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http://www.webdictionary.co.uk/definition.php?query=pleochroism
pleochroism, pleochroisms, pleochromatism 1. The property possessed by some crystals of exhibiting different colors, especially three different colors, when viewed along different axes. 2. The phenomenon of different colors appearing when certain crystals are viewed from different directions. 3. An optical phenomenon where due to double refractio...
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http://www.wordinfo.info/words/index/info/view_unit/1695/2
noun the phenomenon of different colors appearing when certain crystals are viewed from different directions
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https://www.encyclo.co.uk/local/20974
Color changing effect created by light traveling along crystallographic axes causing the mineral to display more than one color when rotating and/or viewing the stone from different angles.
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https://www.encyclo.co.uk/local/22070
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