WELLS AND BUTLER: TUNGSTENITE, A NEW MINERAL 597 



an important producer of lead-silver ores in the seventies. The 

 ore shoot was followed until it was cut off by a fault. Attempts 

 at the time to locate the continuation beyond the fault were 

 unsuccessful and the mine was idle for many years. In 1916 

 Mr. Beeson by a detailed geologic study procured data that in 

 1917 led to the finding of the extension of the ore shoot. It was 

 from this extension below the oxidized zone that the material 

 here described was obtained. 



TABLE 1 

 Chemical Analysis of Tungstentte (By R. C. W.) 



W 



S . ... 



Fe 



Zn 



Mn 



Xi 



Pb 



As 



Sb 



Cu 



Ag 



Si0 2 



H 2 



Undetermined 



ATOMIC 

 RATIO 



1.00 



2.18 



Two specimens of the material were examined chemically. 

 The first specimen contained a much slickensided substance 

 resembling graphite intimately associated with quartz, calcite, 

 pyrite, gelena, and various accessory minerals. Tungstenite 

 was identified in the slickensided material but it was not the 

 only mineral present. The second specimen appeared to be 

 much purer than the first and an average sample of it was analyzed 

 with the results shown in table 1. This specimen was of a uni- 

 form gray color where it had been broken from a larger piece, 

 but two sides were somewhat slickensided. On close examination 



