184 wherry: cavities in zeolite deposits 



on the island of Vulcano, in fumarole deposits, which are geneti- 

 cally related to these "zeolite- veins." There is also a quite 

 analogous occurrence of this mineral at Rosenegg, Wiirttemberg, 

 the igneous rock being in that case a phonolite tuff, while the 

 glauberite has been replaced by both calcite and quartz. 9 



Sumrnary: The lozenge-shaped, prismatic, monoclinic cavi- 

 ties which occur in Triassic shales and especially in the First 

 Watchung Mountain zeolite deposits are believed to represent 

 the mineral glauberite, the crystallographic, geological, and 

 genetic evidence all pointing in the same direction. A full 

 report on this subject, with descriptions of the geologic occur- 

 rences, the crystallographic measurements, figures of specimens, 

 etc., is in preparation. 



9 Leuze. Jahresh. Ver. vaterl. Naturk. Wiirttemberg 1886, 62; 1889, 305; 

 abstracted in Zeit. Kryst. Min. 14: 408. 1888; 20: 303. 1892. 



