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An interferometric survey of the micas (With Plates VII–IX)

Published online by Cambridge University Press:  14 March 2018

S. Tolansky  and
Pamela G. Morris
S. Tolansky
Affiliation:
Royal Holloway College, London University
Pamela G. Morris
Affiliation:
Royal Holloway College, London University
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Extract

In a group of earlier publications details have been given of the application of multiple-beam interference methods to the study of mica. The characteristic structure of this mineral is exhibited by the Fizeau fringes which are produced when one side of a mica slip is silvered and placed against a similarly coated optical flat. The fringes show that the surface is violently contorted and crossed by cleavage steps, the heights of which appear to be integral multiples of the crystal-lattice spacing perpendicular to the basal plane of cleavage. If, however, a mica slip (thickness circa 1/100 mm.) is silvered on both sides then fringes of a totally different appearance are observed. It is frequently found that, despite the distortions on the surface, the Fizeau fringes are large areas of uniform illumination bounded by cleavage ‘lines’.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 28 , Issue 198 , September 1947 , pp. 137 - 145
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1947

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References

page 137 note 1 Tolansky, S., Proc. Roy. Soc. London, Ser. A, 1945, vol. 184, p. 51 ; ibid., 1946, vol. 186, p. 261 ; Phil. Mag., 1946, ser. 7, vol. 37, p. 390. [M.A. 10–134.]CrossRefGoogle Scholar

page 139 note 1 Tolansky, S., Proc. Physical Soc., 1946, vol. 58, p. 654. [M.A. 10–134.]CrossRefGoogle Scholar