320 R. W. G. Wychoff— Crystal Structures of 



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Fig. 2. — A gnomonic projection of the Laue pattern obtained by passing 

 X-rays through a basal (111) section of rhodochrosite (MnC0 3 ). The 

 direction of the rays is approximately normal to the (111) plane. Calcite 

 gives a nearly identical pattern. 



