HEMATITES USED AS FLUXES. 647 



Analysis XXI. Breece iron ore. 

 Ehiiiciitarij unuhism . 



Irou 66.44:i39ii 



Slanguuese 0. 007280 



Nickel aud cobalt Trace 



Ziuc 0. 0-r>201 



Copper 0. 0a-25y7 



Gold 0. oooioy 



Silver 0. C00404 



Arsenic 0. 007174 



Antimony Trace 



Oxygen 27.430173 



Chlorine (traces calculated) 0. 000132 



Water 0.290000 



Carbonic acid 2. 44465.'i 



Phosphoric acid 0. 100740 



Titanic acid 0.052250 



Silica 2. 388500 



Lime 0. 121S00 



Magnesia 0.619900 



Alumina 0.045000 



Loss . 0.000700 



100. 000000 



Silver, 0.13 ounce to the ton. 



Gold, O.OG ounce to the ton. 



Ilulioiial aiiali/sis. 



Peroxide of irou 71. 643540 



Magnetic oxide of irou (Fe304) 18.009740 



Carbonate of irou G. 445000 



Chloride of silver 0.000530 



Gold - 0. 000102 



Arsenic acid (combined with Fe-iOs) 0. OUCOO 



Oxide of copper 0.028300 



Oxide of zinc 0. 031400 



Peroxide of manganese 0.011500 



Oxides of cobalt, nickel, and antimony Truce 



Phosphate of lime 0.218140 



Titanic acid (in the state of titaiiate of irou) 0. 0522.'')0 



Silica 2.3f8500 



Lime 0.004400 



M.iguesia 0.C19900 



Alumina 0.045000 



Water 0.290000 



Loss 0. 00069J 



100. 0000(iO 



Discussion. — The hematite was uot examined either for brotuiue 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 followiug : The hydrochloric solution of hematite is reduced 

 to the minimum of oxidation by sulphureted hydrogeu aud then boiled to expel the 

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



