A. H. Means — New Mineral Occurrences -from Utah. 127 



alogical tests definitely determines the crystalline material as 

 jarosite. Jarosite has been previously noted in the Tintic dis- 

 trict.* The remaining material is not crystalline, being pul- 

 verulent and earthy. From the strong bismuth reaction 

 obtained and the absence of effervescence with HC1, which is 

 typical of bismutite, this material is believed to be bismite. 

 The nature of the occurrence is such, however, as to make 

 absolute proof impossible without a chemical analysis. 



Bismutite, f Bi 2 3 .C0 2 .H 2 0. — This occurrence is from the 

 1050-foot level of the Victoria mine, and consists principally 

 of barite and quartz containing argentite, horn-silver, bismutite 

 and a little native gold. The bismutite was seen in polished 

 section as thin dark veinlets between the argentite and the 

 gangue. Upon treating with HC1, under the microscope, 

 the material was seen to effervesce, the solution giving a posi- 

 tive test for bismuth. An analysis of this material by Dr. R. 

 C. Wells of the U. S. Geological Survey gave : 



Loss on ignition 3*57 



Insoluble in HN0 3 66-10 



Soluble in HN0 3 



C0 2 .... 2-48 



CI 0- 



As 2 6 -05 



PA o- 



Cu .. 0- 



Ag 4-15 



PbO -31 



Fe 2 3 -92 



CaO -76 



MgO 0- 



Bi,O s 18-07 



SO„ -58 



96-99 



Another occurrence of bismutite is from the bottom of the 

 winze on the 12th level of the Eagle and Blue Bell mine. 

 Here straw-yellow crusts occur on a specimen consisting essen- 

 tially of argentite and horn-silver with a little native gold, the 

 specimen being very similar to the one from the Victoria 

 mine described above. The crusts are non-crystalline and 

 effervesce freely in cold dilute HC1, the solution giving a defi- 

 nite bismuth test. 



Bismutite has also been found in considerable amount in the 

 Boss Tweed mine, where it occurs with quartz and barite.:}: 



Aeseno-Bismite, a new bismuth arsenate. — This specimen 

 came from the 600-foot level of the Mammoth mine, where it 



* Tower and Smith, U. S. Geological Surv., 19th Ann. Rept., p. 702, 1898. 



fLoc. cit,, p. 307. 



% Tower and Smith, U. S. Geological Surv., 19th Ann. Rept., p. 703, 1898. 



