Amongst other material of scientific interest brought back 

 by the Carlsberg expedition to East-Greenland, were 

 a variety of zeolites and other minerals, obtained from cavities 

 in the basalt. It was proposed to me that I should undertake 

 the examination of this material. At first I thought it would 

 be desirable to wait until the Geologist of the expedition, Dr. 

 0. Nordenskjold, had published an account of the Geology of 

 the district explored , thinking that I might thus become 

 acquainted with the mode of occurrence of the minerals and 

 the conditions of their formation. In the mean time, however, 

 Dr. NoRDExsKJöLD uudcrtook to be at the head of a South Polar 

 expedition and some considerable time may therefore elapse 

 before the publication of his results. Moreover, I am now 

 engaged in working out a general description of Greenland 

 minerals and cannot therefore omit from such a work an essen- 

 tial part, such as the description of the minerals in question, 

 I have therefore decided to undertake the examination of these 

 minerals now, confining myself, in the present treatise, mainly 

 to an account of their crystallographic properties. 



In addition to the minerals brought back by the above- 

 mentioned expedition, I have also examined a collection of 

 zeolites made by Harz and Bay, who were members of the 

 Ryder expedition in 1891 — 92. Further, I have collected and 

 restated facts already recorded in literature, with regard to the 

 minerals of the East-Greenland basalt, so that the account con- 



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