34 Identity of Pyrochlore with Microlite. 
stores the brown color again; these changes constitute a distinc- 
tive character. With borax on a platina wire, the mineral fuses 
with slight effervescence, the outer flame gives a glass which 
while hot is reddish brown, but becomes pale yellow as it cools; 
the globule in the reducing flame remains clear, and when cold 
is of a pale green color, when flamed a white, enamel is produced. 
The darkest colored fragments give a yellowish enamel, but the 
reducing flame gives as before a light green glass. With a par- 
ticle of oxide of iron the borax globule in the reducing flame 
gives the characteristic reactions of ferruginous titanic acid. 
Phosphoric salt gives in the outer flame a reddish yellow glass 
whilst hot, which becomes green on cooling ; the reducing flame 
gives a clear fine green glass. Tin does not develope the color 
of titanic oxide. Soda does not show the presence of manga- 
nese, but the mineral gives a deep green color to the fused mass 
while hot, which becomes yellowish brown on cooling. One 
grain of the mineral which had been dried was decomposed, the 
titanic acid carefully separated and dried, it weighed 80; this 
had the chemical characters of pure titanic acid. 
_ The solution of the oxides from the titanic acid gave @ precip- 
itate of sulphate of tin, when treated with sulpho-hydric acid, 
and the sulphate oxidized before the blowpipe gave with soda a 
globule of tin. Sulpho-hydrate of ammonia gave a black pre- 
cipitate, which when roasted contained oxides of iron and ura- 
nium, with traces of oxide of cerium. The fluid remaining gave 
with oxalate of ammonia, a precipitate which was converted into 
sulphate of lime, equivalent to 0.08 lime. Thus, 
Titanic acid, . : ; P 80. 
Oxide of tin, 
iron, 
eerium, ‘ Pees ’ 11.8 
uranium, | 
si baled... : ‘ ‘ ° 08.2 
eit 
100.0 
- This mineral is therefore identical with that analyzed by Woh- 
oler. The absence of protoxide of manganese and water, and the 
ee of oxide of iron in this specimen, as indicated 
y the bl Wpipe experiments, will account for the larger propor- 
tion of titanic acid given in the analysis, == st! 
