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Figure 11
The `spheric' or `stereographic' projection technique of Neumann applied to a vesuvianite crystal. The perpendicular drawn from the center upon a facet (or upon the plane in which it is situated) meets the circumscribed sphere at a point, which is, subsequently, linked to the south pole of the sphere. This produces a dot in the circular projection plane defined by the sphere's equator.

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ISSN: 2053-2733
Volume 68| Part 1| December 2012| Pages 3-29
doi:10.1107/S0108767311030315
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