340 Chemical Examination of Microlite. 
Analysis 4 
A. 0:33 gramme of the mineral in the state of an impalpable 
powder was treated ina platina crucible with 1-50 bi-sulphate of 
potassa. After fusion for a few minutes over an alcoholic lamp, the 
crucible was carried to redness in the furnace. The color of the 
fused mass was yellowish white. 
B. Water was boiled on the fused mass (A,) and the contents of 
the crucible transferred at once to a filter. The clear solution that 
passed through was treated with solution of sulphate of potassa. In 
fifteen minutes, a fine white granular precipitate appeared. 
C. The insoluble powder, B, was treated with sulphohydrate o 
ammonia. Its color was thereby changed to greenish black with a 
tinge of blue. Hydrochloric acid was poured on until the powder 
became nearly white. After washing in boiling water, it was trans- 
ferred to a platina crucible and after ignition weighed 0°37 gramme. 
D. The ignited powder, C, was boiled for a few minutes with 
excess of carbonate of potassa, and then treated with hydrochloric 
acid, filtered, washed, dried.and ignited. It weighed 0°255 gramme. 
A portion of it was fused with carbonate of soda before the blowpipe- 
The bead effervesced, and on cooling, became white and opake. 
Another portion was fused with borax. It gave a clear bead, and 
by flaming became white and opake. 
E. The hydrochloric solution, D, was precipitated with oxalate 
of ammonia and the precipitate was heated to whiteness. It weigh- 
ed 0°04 gramme. 
F. The water boiled on the fused mass of the mineral and treated 
with solution of sulphate of potassa, B, was separated from its crys- 
talline precipitate by means of a filter and set aside after having had 
its volume augmented by asaturated solution of sulphate of potassa. 
In a few days a precipitate of fine granular white crystals appeared. 
The fluid was treated with an additional quantity of sulphate of po- 
tassa, whereby the white precipitate was in part, perceptibly dissolv- 
ed. The clear liquid was withdrawn and treated with ammonia. A 
light yellowish white flocculent precipitate appeared, which on igai- 
tion was greyish white, without a tinge of red. The quantity was 
too small to allow me to make any satisfactory experiments upo? 
it; but the fact that the double salt it formed was not soluble in the 
solution of sulphate of potassa, shows that it could not be thorina of 
Zirconia, while its not turning red on ignition proves that it was ot 
