Abstract

The simple heat treatment for decoloring fluorite crystals of various hues is described. The improvement in transmittance is shown by means of spectrophotometer curves.

© 1947 Optical Society of America

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References

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  1. An excellent bibliography on the subject of thermoluminescence is to be found in M. A. Northup and O. I. Lee, “Experiments on thermoluminescence of some common and unusual minerals,” J. Opt. Soc. Am. 30, 206 (1940).
    [CrossRef]
  2. Although at the present time there exists a technique for producing synthetic CaF2, the heat treatment discussed in this note is simple as well as very inexpensive and may render available for optical purposes a reasonable fraction of what is now inferior fluorite.

1940 (1)

J. Opt. Soc. Am. (1)

Other (1)

Although at the present time there exists a technique for producing synthetic CaF2, the heat treatment discussed in this note is simple as well as very inexpensive and may render available for optical purposes a reasonable fraction of what is now inferior fluorite.

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Figures (2)

F. 1
F. 1

Transmittance curves for pale purple natural fluorite. Curve A—polished plate of pale purple fluorite, 2.77 mm thick. Curve B—polished plate of decolored pale purple fluorite, 1.22 mm thick. Curve C—polished plate as in curve B, after irradiation with x-rays.

F. 2
F. 2

Transmittance curve for a 1.22-mm thick polished plate of amber-colored fluorite.