670 Ford and Bradley — Footeite and Connellite. 



Art. LI. — On the Identity of Footeite with Connellite 

 together ivith the Description of two new Occurrences of 

 the Mineral ; by W. E. Ford and W. M. Bradley. 



Some time ago a suite of specimens from the Bisbee District 

 was sent to this Laboratory by the Foote Mineral Co. of Phila- 

 delphia. These specimens were of cuprite upon which occurred 

 small radiating groups of slender prismatic crystals having a 

 beautiful blue color. Tests upon the latter showed that it was 

 a hydrous copper chloride and at first it was considered to be 

 the rare mineral, footeite. This conclusion was strengthened 

 when, through the courtesy of Mr. L. P. Gratacap of the 

 American Museum ef Natural History in New York City and 

 of Dr. W. T. Wherry of the National Museum in Washington, 

 it became possible to compare the Bisbee mineral with speci- 

 mens of the original footeite. Optical tests showed that the 

 two were identical. 



A little later specimens from the Tintic District, Utah, were 

 sent to us by Mr. Lazard Cahn which showed a mineral almost 

 identical in appearance and association with the blue mineral 

 from Bisbee. This mineral was labeled connellite and upon 

 testing gave the expected reactions for a small amount of the 

 sulphate radical. This naturally led to a more detailed exami- 

 nation of the mineral from Bisbee and it was found that the 

 original tests had been incomplete and that it also contained 

 sulphuric acid and was therefore connellite. Further, a test 

 made upon a small crystalline fragment from one of the 

 specimens of the original footeite preserved in the American 

 Museum of Natural History gave the same reaction. As the 

 optical and crystallographic characters of these three occur- 

 rences also agreed perfectly with those given for the original 

 connellite from Cornwall, there was no question but that they 

 all belonged to the same species. As the name, connellite, has 

 priority over that of footeite, the latter must therefore be dis- 

 carded. The detailed description of the investigation follows. 



Footeite. — A hydrous copper chloride from the Copper 

 Queen mine, Bisbee, Arizona, was described in 1891 by G. A. 

 Koenig* and named footeite in honor of Mr. A. E. Foote of 

 Philadelphia. The footeite was associated in its occurrence 

 with another new species which was named paramelaconite and 

 both minerals were found with malachite upon limonite. The 

 footeite, of which only a small amount was observed, occurred 

 in minute needle-like prismatic crystals. The crystal habit 

 was described as apparently hexagonal, but because of the ob- 

 *Proc. Acad. Phil., 291, 1891, and Zs. Kr., xix, 601, 1891. 



