The Stereographic Projection: A Procedural Revision in Crystallography

M. J. Oppenheim
Department of Geology, The Hebrew University of Jerusalem, Israel

Summary: Objections are raised to the custom of reversing the pole of projection when dealing with lower crystal faces, for some points so projected no longer retain their natural interangular relations. Instead, lower face normals may be replaced by their antipodal points; these antipodal points are then projected in the usual manner, with suitable symbols. The resultant stereographic projection not only portrays all crystal faces within the primitive circle but is also strictly angle-true.

Mineralogical Magazine; December 1963 v. 33; no. 263; p. 697-700; DOI: 10.1180/minmag.1963.033.263.07
© 1963, The Mineralogical Society
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