536 PaZacfie and Warren — Chemical Composition and 



Table I. 





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x 6395 



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16.4.20.5 



12.3.15.5 



18/5 9/5 





of faces, so that of the hundred or more placed on the gonio- 

 meter for trial, more than two-thirds had to he rejected. Some 

 thirty ciwstals, however, proved to be measurable and the 

 results of their study are here presented. 



The basal plane is almost always present, generally relatively 

 large and always very brilliant, so that it served admirably for 

 the adjustment of the crystals on the two-circle goniometer. 

 Although of prismatic habit, the prism planes are rarely more 

 than rudimentary, the prismatic appearance being produced by 

 oscillatory combination of steep rhombohedrons or pyramids, 

 as in other occurrences of parisite. 



Three types of combination may well be distinguished : (1) 

 rhoniboheclral, a single rhombohedron of either position being 



