3-42 Palache and Warren — Krohnkite, Natrochalcite. 



Art. X.X.X1K.— Krohnkite, Natrochalcite fa new mineral), 

 and other Sidphates from Chile ; by Charles Palache and 

 C. H. Warren. 



The minerals briefly described in this paper* were sent to 

 the Harvard Mineralogical Laboratory for identification by the 

 Foote Mineral Co. of Philadelphia, whose manager, when the 

 scientific interest of the material was pointed out, at once 



placed at our disposition all of the material in his possession 

 with generous permission to use whatever was necessary for 

 the investigation. 



The collection comes from the mining district of Chuqui- 

 camata in the Province of Antofagasta, Chile. It was obtained 

 from exhausted copper veins and includes the following species : 

 krohnkite, natrochalcite (a new mineral), blodite, brochantite, 

 atacamite, chalcanthite, copiatite, botryogen, sideronatrite, 

 halite and gypsum. 



Krohnkite. 



Krohnkite is the most abundant mineral in the collection and 

 appears in three distinct habits, as follows : 



* A more extended crystallographic description of this material will appear 

 hortly in Zeitschrift fur Krystallographie. 



