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X-Ray examination of aramayoite

Published online by Cambridge University Press:  14 March 2018

Kathleen Yardley*
Affiliation:
Davy-Faraday Laboratory, Royal Institution of Great Britain

Extract

An attempt was made to determine the true symmetry of the cleavage flakes of aramayoite by means of the Laue photographic method. Since X-ray diffraction takes place within the crystal, the lack of welldeveloped faces other than main cleavage faces was no disadvantage. One feature, however, which did prove a difficulty, was the pliability of thin clevage flakes referred to by Dr. Spencer. It was essential that the whole of the main cleavage face upon which the X-ray beam was incident should be strictly perpendicular to that beam. In order to ensure this, only those flakes were used which gave a single optical reflection, and two distinct methods of setting were resorted to. In the first case the slit (circular aperture) was used vertically ; the flat end of the slit system was ground truly perpendicular to the slit itself and was thus horizontal.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1926

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References

page 163 note 1 L. J. Spencer, Aramayoite, a new mineral, from Bolivia. This vol., p. 15.

page 164 note 1 Hull, Cf. A. W. and Davey, W. P., Physical Rev., 1921, vol. 17, p. 549 CrossRefGoogle Scholar.