146 Van Horn and Htmt — Bournonite Crystals. 



found, upon examination of specimens, that the mineral occurred 

 frequently in the ores of the district, where it has been mis- 

 taken for tetrahedrite probably for a long period of years. Mr. 

 Maynard Bixby of Salt Lake City, who is an authority on Utah 

 minerals, was not aware of the existence of the mineral at 

 Park City, and the writer has called attention to the new occur- 

 rence in another paper.* 



Fig. 1. 



Fig. 2. 



Fig. 1. Photograph of Bournonite Crystal No. 2 (natural size), from Case 

 Collection. Found at Silver King Mine. 

 Fig. 2. Crystal No. 1 , from Holden Collection now at Harvard University. 



Fig. 3. 



Fig. 4. 



Fig. ?>. Drawing of Crystal No. 2, from the collection of Case School of 

 Applied Science. This drawing shows the right-hand side of the crystal, 

 while fig. 1 is a view of the left-hand side. 



Fig. 4. Crystal No. 3, from the collection of the University of Utah. 



The senior writer became much interested in this new local- 

 ity for bournonite, and arranged to borrow the other two 



* The Occurrence of Bournonite,. Jamesonite, and Calamine at Park City, 

 Utah, by Frank R. Van Horn, Bulletin 92, Amer. Inst, of Min. Ene;., August 

 1914, pp. 2223, 2230. 



