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E. II Kraus— Celestite-B earing Rocks. 



tite does occur very extensively in the dolomitic limestones of 

 the Monroe series in a disseminated condition, and secondly, 

 that when the mineral is thus disseminated it is usually in the 

 form of well-defined crystals of either a prismatic or tabular 

 habitus, and thirdly, that since celestite is, as previously shown, 

 quite readily removed by the continued action of water, we 

 have every reason to believe that the phenomenon referred to as 

 " gashing" or " acicular structure" has been produced by the 

 mineral celestite. 



As previously noted, the celestite in these three localities 

 occurs in a so-called disseminated condition, that is, the mineral 

 is distributed throughout the rock. Figure 2 represents- a 

 specimen from Jamesville, N. Y. The rock is a drab dolomitic 



3 4 



limestone. The cavities, as can be readily seen, are all sharp and 

 angular, and range from one-quarter of an inch up to an inch or 

 more in size. In the interior of these specimens a considerable 



