| pleochroism |
the phenomenon of different colors appearing when certain crystals are viewed from different directions
출처: wordnet.princeton.edu/perl/webwn
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| pleochroism |
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.
출처: www.inlandlapidary.com/user_area/glossaryP.asp
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| pleochroism |
In doubly refractive gemstones the light ray is split and each part refracted (bent) to a different degree. Assuming this ray is made up of white light (which is composed of all colours) each ray has various colours absorbed (filtered) so that each ray as it emerges from the gemstone is a different (residual) colour. This is called dichroism (means two colours). Thus depending upon the direction one looks at the stone relative to the crystal and optical axes a different colour is seen. ...
출처: www.ganoksin.com/borisat/nenam/physical.htm
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| pleochroism |
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. Using a wide value range when searching this field.
출처: www.nslc.ucla.edu/pet/definitions.html
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| pleochroism |
A property of double refractive colored stones in which varying colors are sometimes visible at different viewing angles.
출처: www.thegemtrader.com/Glossary.htm
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