126 A. H. Means — New Mineral Occurrences from Utah. 



given off. On coal a zinc coating- appeared after heating before 

 the blow-pipe. Lead, iron, calcium and magnesium were 

 tested for, and were found to be absent. 



This occurrence is interesting because, so far as the author 

 is aware, it is the first time adamite has been found in the 

 United States. The other localities from which this mineral 

 is reported being : Chanarcillo, Chile ; Cap Garonne, France ; 

 and in the ancient zinc mines of Laurium, Greece.* 



DAUBREEiTE,t (?) 2Bi 2 3 .BiCl 3 .3H 2 0. — The specimen comes 

 from the 1200- foot level of the Eagle and Blue Bell mine, and for 

 the most part is composed of quartz, barite, cerussite, together 

 with some alunite, jarosite, daubreeite (?) and bismite (?). Upon 

 this specimen there occurred rosettes of small yellow-brown 

 crystals of brilliant luster. In habit they appeared to be slen- 

 der prisms of hexagonal cross-section, surmounted by truncating 

 faces. The mineral was partially soluble in water, the solution 

 reacting strongly for chlorine. A strong bismuth reaction was 

 also obtained in the wet way.;}; Water was given off in the 

 closed tube, together with a very faint white sublimate which 

 may be PbCl 2 . The only definite tests obtained were for chlo- 

 rine, water and bismuth. The mineral is certainly a hydrous 

 bismuth chloride and as daubreeite is the only such listed in 

 Dana,§ it is reasonable to conclude that the mineral is either 

 daubreeite or a new species. Unfortunately the supply of 

 material was limited and there is not enough of it remaining 

 for additional tests. 



Bismite,! (?) Bi 2 3 , and Jabosite,1~ K 2 0.3Fe 2 3 .4S0 3 .6H 2 0. 

 — Upon another portion of the same specimen described under 

 the heading daubreeite there occurred a yellowish-brown fri- 

 able material which gave the following tests : 



A strong bismuth reaction, both in the wet way and on char- 

 coal. Magnetic after heating on charcoal. Soluble in HC1 

 without effervescence, j^o arsenic with soda and charcoal in 

 closed tube. Water in closed tube. Strong sulphate test. 

 Yery slight chlorine test. Faint lead test. 



Under the microscope, light yellow-brown hexagonal prisms, 

 the bases of which were divided in six segments, were seen. 

 The form is typical of jarosite. This coupled with the miner- 



* Loc. cit., p. 787. fLoc. cit., p. 174. 



% Tread-well and Hall, 2d Edition, p. 166, 1908. The Bi-test is as follows : 

 To a few drops of SnCl 2 add strong KOH till the precipitate formed just 

 dissolves. To this solution add a hydrochloric acid solution of the substance 

 to be tested. If bismuth is present a black precipitate of metallic bismuth 

 will form instantly. The reactions are : 



SnCl 2 + 2KOH = 2KC1 + Sn(OH) 2 

 Sn(OH)o + 2KOH - 2H 2 + Sn(OK) 2 

 2BiCl 3 + 6KOH = 6KCl + 2Bi(OH) 3 

 2Bi(OH) 3 + 3Sn(OK) 3 = 3H 2 + 3SnO(OK) 2 + Bi 2 . 

 § Dana's System of Mineralogy. 6th Edition, p. 174, 1911. 

 || Loc. cit., p. 200. IT Loc. cit., p. 974. 



