HEMATITES USED AS FLUXES. 647 



ANALYSIS XXI. BREECE IKON ORK. 



Elementary 



Iron ....................... ........................................ 66.443392 



Manganese .......................................................... 0.007280 



Nickel and cobalt ..................... ............................... Trace 



Ziuc ................................................................ 0. 025201 



Copper .............................................................. 0.022597 



Gold ................................................................ 0.000102' 



Silver .............................................................. 0. C00404 



Arsenic ... .......................................................... 0.007174 



Autimqny .......... . ................................................ Trace 



Oxygen ............................................................. 27.4301715 



Chlorine (traces calculated) .......................................... 0. 000132 



Water .............................................................. 0.290000 



Carbonic acid ....................................................... 2.444655 



Phosphoric acid ..................................................... 0.100740 



Titanic acid ......................................................... 0.052250 



Silica ..................................................... . ......... 2.388500 



Lime ................................................................ 0. 121800 



Magnesia ..................... ....................................... 0.619900 



Alumina ............................................................ 0.045000 



Loss . 0. 000700 



100. 000000 



Silver, 0.13 ounce to tbe ton. 



Gold, 0.06 ounce to tbe ton. 



IMlonal analysis. 



Peroxide of iron 71.843540 



Magnetic oxide of iron (Fe 3 O 4 ) 18.009740 



Carbonate of iron 6.445000 



Chloride of silver 0.000536 



Gold 0. 000102 



Arsenic acid (combined with FejO 3 ) 0. OIK 00 



Oxide of copper 0.028300 



Oxide of zinc 0. 031400 



Peroxide of manganese 0.011500 



Oxides of cobalt, nickel, and antimony Trace 



Phosphate of lime 0.218140 



Titanic acid (in the state of titunale of irou) 0.052250 



Silica 2.388500 



Lime 0.004400 



Mnguesia 0.619900 



Alumina 0.045000 



'Water 0.290000 



Loss . . 0. 000692 



100. OOOOC.O 



Discussion. The hematite was not examined either for bromine or iodine, with 

 which silver is generally combined in Leadville. Chromium, tungsten, molybdenum, 

 and vanadium were carefully sought for, but no traces of these metals could be detected. 



Titanium could only be found by a method which was specially devised for its 

 detection, and which is the following : The hydrochloric solution of hematite is reduced 

 to the minimum of oxidation by sulphureted hydrogen and then boiled to expel the 

 excess of this gas. The solution is then as nearly as possible neutralized with an 



