ETYMOLOGY OF THE WORD PLEOCHROISM
Pleo- + -chroism, from Greek khrōs skin colour.
10 ENGLISH BOOKS RELATING TO «PLEOCHROISM»
Discover the use of
pleochroism in the following bibliographical selection. Books relating to
pleochroism and brief extracts from same to provide context of its use in English literature.
The second change in dispersion may be of diagnostic value in distinguishing
minerals in the two compositional ranges Fs15 to Fs50 and Fs50 to Fs80.
Pleochroism. Many orthopyroxenes in the bronzite-hypersthene compositional
range are ...
William Alexander Deer, Robert Andrew Howie, J. Zussman, 1997
Pleochroism is the collective term for any such phenomena. If two main colors
can be observed, it is often called dichroism; three colors, trichroism. Dichroism is
possible only in tetragonal, hexagonal, and trigonal crystal systems; trichroism ...
With the diamond cut, the ideal total reflection and the highest brilliance has been
reached. Pleochroism Some gems appear to have different colors or depth of
color when viewed in different directions. This is caused by the differing
absorption ...
The effect is called pleochroism ('many coloured'), and when the light passing
through the stone is split into two colours or shades the stone is said to be
dichroic; if three colours or shades are produced, the gem is trichroic. Dichroism
is ...
5
Fundamentals Of Optical, Spectroscopic And X-Ray Mineralogy
however, show pleochroism beyond the optical region and are studied by
spectrophotometers, aided by polarisers. This has been discussed in chapter III.
2.4.1. Polarisation colour and pleochroism for mineral identi Heat ion Primarily
colour is ...
6
Mineralogical Applications of Crystal Field Theory
Pleochroism, or dichroism when it occurs in uniaxial crystals, may be observed in
minerals belonging to all crystal systems except the cubic system. This fact
provides one clue to the cause of pleochroism, that it originates within cations in ...
7
Rock Forming Minerals 3B: Layered Silicates Excluding Micas ...
Where both a and y have been determined, the birefringence can be shown to
increase dramatically with increasing Fe'+ (from -0.030 to >0. l00). but because of
the intensity of pleochroism this is difficult to observe. Most stilpnomelanes show
...
William Alexander Deer, Robert Andrew Howie, J. Zussman, 2009
8
Monteregian Treasures: The Minerals of Mont Saint-Hilaire, ...
50° Orientation: Z = b; Y:c = 12° Pleochroism: X greenish-blue, Y pale orange-
yellow, Z brownish-green or violet (CA-4) Biaxial (-): a= 1.688, /3= 1.700, y=
1.704 (589 nm) 2V: meas. = 60°; calc. = 59° Orientation: Z = b; Y:c = 13.5°
Pleochroism: ...
Joseph Anthony Mandarino, Violet Anderson, 1989
9
Crystal Identification with the Polarizing Microscope
COLOR, ABSORPTION, AND PLEOCHROISM Most colored uniaxial crystals
show differential absorption of transmitted light related to vibration directions
associated with e and w. If a different amount of some wavelengths of light is
absorbed ...
R.E. Stoiber, Stearns Anthony Morse, 1994
PLEOCHROISM If white light is transmitted through any substance it will be found
that somewhat less light emerges than entered. In other words, it will be found
that the substance absorbed part of the light. If the amount of light absorbed is ...
4 NEWS ITEMS WHICH INCLUDE THE TERM «PLEOCHROISM»
Find out what the national and international press are talking about and how the term
pleochroism is used in the context of the following news items.
Gems & Gemology Illuminates Sri Lanka's Gem Industry
The issue also reveals the unusual beauty found within non-nacreous pen pearls, a practical look at the phenomenon of pleochroism and its ... «Rapaport, Nov 14»
Unravelling a Volcano Using Crystals Under a Microscope
This image is in plain polarized light, so the amphibole are showing one of their diagnostic properties, pleochroism. Image by Erik Klemetti. «Wired News, Dec 11»
Rare Ceylon Alexandrite for Sale
Pleochroism: Trichroic – Strong. Absorption spectrum: Corresponding absorption detected. Remarks: Displays a very strong colour change in ... «Internet Stones. COM Media, May 10»
New Coated Tanzanite Difficult to Detect
In addition, because the tanzanite had some intrinsic color before being coated, the stones still exhibited some of the pleochroism (the ... «Diamonds.net, Oct 08»
