128 A. U. Means — JSfew Mineral Occurrences from Utah.. 



occurs in large amounts, and consists of a heavy yellow friable 

 material, which is believed to be a new mineral species, limon- 

 ite, barite, and a little erinite and mixite. In closed tube with 

 soda and charcoal a heavy arsenic mirror was obtained, while 

 on coal before the blowpipe a large yellow coating of bismuth 

 oxide appeared. About half a kilogram of the material was 

 crushed in a mortar and put through 80-mesh, then vanned on 

 a vanning shovel, about 30 grams of concentrates being obtained. 

 The concentrates were examined, under the microscope, and seen 

 to contain a yellowish-brown mineral in crystalline aggregates, 

 considerable barite and 2*0 per cent (estimated by micrometric 

 methods) limonite. Some of these concentrates were treated 

 with hot HC1, and the residue, w T hich was examined under the 

 microscope, was seen to consist solely of barite, everything else 

 having gone into solution. An analysis of the concentrates by 

 Dr. R. C. Wells of the United States Geological Survey is 

 given below : 



Insoluble in HCl: 



S0 3 16-60 



BaO (calculated) 31-90 \ 49-92 



Si0 2 (difference) 1-42 



Soluble in HCl : 



Bi„0 3 28-17 



As„0 5 10-59 



Fe 2 3 3-88 



A1 2 6 -44 



CuO -12 



CaO -62 



MgO - tr. 



S0 3 .- -46 



H 2 0- • 1-09 



H 5 0+ ___. 1-43 



P 2 5 '04 



Sb a O, .-..-- T26 



PbO 1-12 



99-14 



A determination of hygroscopic water was made by the 

 author by placing a weighed sample in a desiccator containing 

 strong sulphuric acid which had previously been heated to 

 boiling to expel all water. The sample was kept in this desic- 

 cator until constant weight was obtained, which required about 

 three weeks. The loss in weight was 0'38 per cent, and may 

 perhaps be considered as representing hydroscopic water, the 

 water remaining being water of crystallization. 



Considering now the molecular ratios, from which the 0'38 

 per cent water has been deducted, there result : 



