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pleochroism::noun | Spocien Dictionary
| Type | Words |
|---|---|
| Type of | optical phenomenon |
| Has types | dichroism, trichroism |
Examples of pleochroism
pleochroism
Alexandrite displays a color change dependent upon light, along with strong pleochroism.
From the en.wikipedia.org
It is hard, dense, black and usually idiomorphic, with a red-brown pleochroism in petrographicthin section.
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Resembles quartz can be distinguished by pleochroism.
From the en.wikipedia.org
Tourmaline is notable for exhibiting strong pleochroism.
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They may exhibit pleochroism or double refraction.
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If absorption of light varies with the angle relative to the optical axis in a crystal then pleochroism results.
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This color change is independent of any change of hue with viewing direction through the crystal that would arise from pleochroism.
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Gems are sometimes cut and set either to display pleochroism or to hide it, depending on the colors and their attractiveness.
From the en.wikipedia.org
In mineralogy, such properties, known as pleochroism, are frequently exploited for the purpose of identifying minerals using polarization microscopes.
From the en.wikipedia.org
- The phenomenon of different colors appearing when certain crystals are viewed from different directions
- (pleochroic) of or relating to or having pleochroism
- Pleochroism is an optical phenomenon in which mineral grains within a rock appear to be different colors when observed at different angles under a polarizing petrographic microscope.http://webmineral.com/help/Pleochroism.shtml Webmineral: Pleochroism in minerals
- (Pleochroic) Different colours are displayed when the gemstone is viewed from different angles. When cutting most pleochroic gemstones, such as Iolite and Tanzanite, cutters typically try to minimize the pleochroism and maximize the single most prominent colour.
- (pleochroic) said of a mineral which changes color in PPL when polarizer is rotated 90 degrees; diagnostic of biotite, hypersthene, hornblende, chlorite...
- The ability of certain gems to display two or more colors when viewed from different angles. This is a term also used for Dichroism and trichroism.
- The average index of refraction of the mineral [(highest+lowest)/2] minus 1.537, the index of refraction of Canada balsam. For minerals with high birefringence, like the carbonates, relief will be difficult to use in a search because of this averaging. ...
- Variation in absorption with direction in doubly refractive colored stones. Uniaxial crystals can potentially show two colors, while biaxial crystals may show up to three colors. ...
- (n) 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.
