Mineralogy

1981 Edition

Anisotropism

  • Ernest E. Wahlstrom
Reference work entry
DOI: https://doi.org/10.1007/0-387-30720-6_8

Anisotropism (anisotropy) characterizes substances that exhibit physical properties with different values when measured in different directions. The specific response of these substances to an internal or external stimulus also differs according to the kind of stimulus and the manner and direction or directions of its application. Anisotropism to some kinds of stimuli is observed in all crystals, in many strained, noncrystalline substances, and in aggregates and accumulations of discrete particles or larger bodies in which there exists at least some degree of parallelism of a linear or planar fabric or of structural elements. Optical anisotropism is exhibited by light-transmitting substances through which light of a particular frequency travels with different velocities for different directions of transmission. Such substances doubly refract transmitted light and are described as birefringent. Optically, anisotropic opaque substances reflect or absorb light in varying degrees...

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References

  1. Born, M., and Wolf, E., 1959. Principles of Optics. New York: Pergamon Press, 803p.Google Scholar
  2. Ditchburn, R. W., 1963. Light, 2nd ed., New York: Interscience (Wiley), 833p.Google Scholar
  3. Turner, R. J., and Weiss, L. E., 1963. Structural Analysis of Metamorphic Tectonites. New York: McGraw-Hill, 545p.Google Scholar

Copyright information

© Hutchinson Ross Publishing Company 1981

Authors and Affiliations

  • Ernest E. Wahlstrom

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