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The graphical determination of angles and indices in zones1

Published online by Cambridge University Press:  14 March 2018

G. F. Herbert Smith
G. F. Herbert Smith*
Affiliation:
Mineral Department of the British Museum
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Extract

Nine years ago (in 1904) I described a diagram—the moriogram, as I called it—which served for the graphical determin.stion of angles and indices in the case of zones in which the principal poles included a right angle. It was, therefore, restricted in its application to zones in the cubic, tetragonal, orthorhombic, hexagonal, and rhombohedral systems, and to zones in the monoclinic system passing through the pole of symmetry. Although the moriogram may be used with sufficient accuracy for practical purposes in the case of many substances with triclinic symmetry, in which the angles between the principal poles differ little from right angles, there necessarily remain many instances in which it cannot be applied with any approximation to accuracy.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 16 , Issue 77 , July 1913 , pp. 326 - 330
Copyright
Copyright © 1913, The Mineralogical Society

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References

page 326 note 2 Mineralogical Magazine, 1904, vol. xiv, pp. 49-53.

page 330 note 1 Extracted from Dana's ‘ System of Mineralogy,’ Sixth edition