CLARKE AND"] 
STEIGER. J 
CONSTITUTION OF ANALCITE. 
21 
D. Six grams of mineral and 28 of chloride, mixed by thorough grinding, were 
heated to 350° for fourteen hours; then wore reground with 28 grams of fresh N 11,01 
and heated for thirty-five hours. Loss of weight, 0.13 per cent; 5.07 per cent of 
soda was extracted as chloride, plus 0.14 of ammonium chloride unexpelled; 2.03 
per cent of silica was rendered soluble in sodium carbonate. 
So far, three facts are noticeable. First, the weight of the mineral 
after treatment is almost exactly the same as before; showing that 
gains and losses have balanced each other. Second, little silica has 
been split off. Third, approximately, but not rigorously, one-half of 
the soda had been converted into NaOl. In A, it was exactly half; in 
the other experiments, a little less than half. Furthermore, in the 
sodium chloride dissolved oat there is only a very little ammonium 
chloride, amounting at most to 0. 14 per cent, calculated upon the 
weight of the original mineral. 
In the residue of the analcite after extraction of sodium chloride, 
abundant ammonia can be detected, with either no chlorine or at most 
a doubtful trace. If, however, the unleached mineral, still retaining 
its sodium chloride, be heated strongly, say from 400° up to redness, 
NH 4 01 is regenerated and given off. Its absence, as such, both from 
the leach and the residue was repeatedly proved. The ammonia and 
water retained by the analcite after heating to 350° with ammonium 
chloride were several times determined; and the following percentages, 
still reckoned ou the original mineral, were found: 
InB 
InC 
In D 
In D 
In D 
Mean 
NH 3 . 
2.20 
H 2 0. 
2.03 
2.25 
2.19 
2.00 
2.36 
1.89 
2.35 
2.06 
2.04 
Correcting the ammonia for the 0.14 of NH 4 01 found in D, the mean 
value becomes 2.15. This permanent ammonia is not given off upon 
warming the material with caustic soda solution, and is therefore not 
present as a salt. The determinations of it were made by three distinct 
methods, and there is no possible doubt as to its presence and character. 
The composition of the analcite after the treatment with ammonium 
chloride may now be considered, with the subjoined combination of the 
data. The NaCl in A, 11.50 per cent, was in material which had gained 
2.18 per cent, and is subject to a correction which reduces the figure 
to 11.26. In B, C, and D the corresponding correction is so small that 
it may be neglected. The last column gives the composition of the 
leached residue, recalculated to 100 per cent, after deduction of NaCl 
and the soluble silica. The letters refer back to the several experi- 
ments, and the little iron 
included with the alumina. 
