82 A Description of a New Mineral Species. 
monia was added, the opaline fluid was then poured on a porous fil- 
ter, covered by a bell resting on moist hydrate of lime, to prevent 
the absorption of carbonic acid. After draining, the bulky hydrate was 
washed in hot pure -water, transferred to a dilute solution of pure 
potash, and boiled in it: a portion B. remained insoluble, after treat- 
‘ing it with more potash, this being separated, the clear solution was 
evaporated and heated till a dry salt remained ; muriatic acid and 
water then dissolved all but pure white silica weighing after ignition 
.12. The acid fluid was mixed with ammonia and carbonate of am- 
monia, the latter being in excess; the fluid was allowed to rest on the 
precipitate twenty four hours, it was then separated by a double pre- 
pared filter from the colorless hydrate ; the latter being washed, was 
dried and ignited, till it suffered no further loss by heating; its true 
weight was 10.74. It was soluble in fused bi-sulphate of soda; after . 
expelling the excess of acid, dissolving the salt and testing the solu- 
tion, no trace of phosphoric acid remained; before the blowpipe it 
appeared as pure alumina. The solution af carbonate of ammonia 
and muriate of potash in which the alumina had been digested, con- 
tained no earthy matter, or phosphoric acid. 
IV. That fluid which had drained from the first precipitate in IIL. 
had been secluded from carbonic acid, it was clear and slightly alka- 
line, a distilled solution of carbonate of ammonia being added, at 
first did not produce a change, after a few minutes a granular pre- 
cipitate C. resembling carbonate of lime fell, leaving a transparent 
solution above it. After separating the powder from the fluid by a 
double filter and drying, it was weighed, then heated red hot, cooled 
and again weighed, it had suffered no loss, after the usual reductions 
8.08 parts were obtained. Boiled in sulphuric acid till part was 
evaporated, treated with much alcohol, there remained a quantity of 
sulphate of lime equivalent to 8.08 of carbonate of lime and no 
trace of phosphoric acid was present in the alcoholic fluid, it was 
therefore pure and is equal to 4.55 lime. 
V. The precipitate B. of III. which was insoluble in potash was 
washed into diluted muriatic acid, it slowly dissolved with the charac- 
ters of a non-alkaline oxide, giving a yellow colored solution, which 
could not be rendered neutral without precipitation taking place. 
Much muriate of ammonia being added, a slight exeess of caustic 
ammonia was dropped in and the matter which separated was col- 
lected on a double filter, when dried it-became opake and after ig- 
nition and reduction its weight was 2.01. ‘It appeared as a yellow- 
