ILLEBRAND.] 
COMPOSITION OF YTTK1AL1TE. 
05 
Cerium and thorium wore separated by a combination of the am- 
aonium oxalate and thiosulphate methods. The weighed thoria was 
aire white, the ceria of a pale salmon color. 
The condition of the uranium was shown by its precipitability as 
Btranuoride on dissolving the mineral in hydrofluoric acid. This 
eaction afforded a ready means of estimating with exactness the 
errous iron by permanganate after rapidly filtering off the fluorides 
frecipitated in an atmosphere of carbon dioxide. Solution of the 
lineral in a sealed tube with dilute sulphuric acid allowed of finding 
he oxygen value of both U0 2 and FeO b}^ permanganate. The result 
bus found for U0 2 agreed marvelously well with that calculated from 
be U 3 8 found gravimetrically in a separate portion. 
Hillebrand. 
Mackintosh. 
Molecular 
ratios. 
Molecular 
ratios. 
iO, 
29. 63 
.05 
10. 85 
«1. 64 
3.07 
c5. 18 
<43. 45 
0. 4938 
29.17 
0. 4861 
i0 2 
h0 2 
[• . 0470 
> . 1930 
> . 0608 
12. 00 
?>. 79 
1.86 
<*2. 94 
/22. 67 
f/5. 30 
H. 50 
U4.03 
.55 
| . 0483 
o, 
fog 
a 2 3 , etc 
lA, etc 
1 1 
' . .1864 
11 
1,0, 
A 

.76 
1.96 
.88 
.80 
.67 
.16 
.32 
.04 
.11 
.12 
.31 
2. 89 
. 77 
.85 
.60 
} ■» 
iO 


;0 
. 0655 
above 105° C 
below 105° C 
), 
He..o 
- diff 
Alk. J 
100. 00 
99. 75 
1 II «Volumetrical!y. Gravimetrically 1.62 per cent. 
• bGiven as .83U0 3 bv Mackintosh. 
.1 t cAt. W. 143.8 (Mol. W. 335.6). 
[I dAt. W. 162 (Mol. W. 372). 
<?At. W. 108.8 (Mo!. W. 265.6). 
Dull. 262—05 5 
/"At. VV. 110.3 (Mol. W. 20s. 6). 
(/At. W. 110.53 (Mol. W. 269.06). 
h\t. W. 114.9 (Mol. W. 277.8). 
*At. W. 120 (Mol. W. 288). 
