24 JOURNAL OF THE 



Per cent. Zircoiiia 62.82; 62.59; 63.12; 62.80; 



Percent. Silica ^-- 34.10; 34.20; 33.52; 34.10; 



Percent. Ferric Oxide 3-29; 



or, taking- the ineaiLs, 



Z2O2 = 62.83 



SiO^ = 33.98 



Fez O3 = 3- 29 



100.10 

 It is not right to calculate the iron as all in the oxidized 

 condition, as much of it comes from the iron mortar and 

 can be easily separated with a magnet. 



QUANTITATIVE ANALYSIS OF THE ZIRCON. 



BY J. M. MOREHEAD. 



In the following analysis it was found most convenient 

 to fuse a portion of the zircon by the Einnemann process, 

 as modified in the preceding article, and from that portion 

 to make the determinations of zirconia and iron. For the 

 silica a second portion was fused with sodium hydroxide, 

 without the use of fluoride. Several other modes of fusion 

 were first tried without satisfactory results. 



The method recommended by Classen was tried. One 

 gram of the powdered zircon was fused with five grams 

 each of sodium and potassium carbonate. Heating for one 

 and a half hours with the blast lamp failed to effect thor- 

 ough fusion. The cooled mass was leached out with 

 water, acidified with hydrochloric acid and filtered away 

 from the unattacked residue. This process was repeated 

 four times, fusing in each case with the same weights of 

 carbonates. It was then found that out of the original 

 gram of zircon .36 gram remained undissolved. This 

 method was abandoned. 



