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The relationship between polarization colors and rotation properties of anisotropic minerals

Lewis Howard Green
The relationship between polarization colors and rotation properties of anisotropic minerals
Economic Geology and the Bulletin of the Society of Economic Geologists (June 1952) 47 (4): 451-458

Abstract

The color of an anisotropic mineral under crossed nicols in reflected light is a function of the rotational properties of the mineral for various wave lengths of light.When a mineral is placed in a position midway between the extinction positions as determined with crossed polarizer and analyser and the analyser is then rotated, a series of colors is produced. The relative dispersion of the apparent angles of rotation (DAr) for various wave lengths of light may be determined from the color sequence. Those wave lengths having the smallest angle of rotation are compensated first and the mineral grain shows the complementary color. Thus the relative dispersion of the apparent angles of rotation is the reverse of the succession of colors observed in the grain.A basic explanation for the color of anisotropic minerals with crossed polarizer and analyser is given and the possible application of these colors to mineral identification considered.


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 47
Serial Issue: 4
Title: The relationship between polarization colors and rotation properties of anisotropic minerals
Author(s): Green, Lewis Howard
Pages: 451-458
Published: 195206
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
Accession Number: 1959-011912
Categories: Mineralogy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: tables
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Society of Economic Geologists. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1959
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