Analysis of Argentine and Steatite. 335 
acids, is too well known to make a more detailed statement 
necessary in the present case. Muriatic ots Soap all 
the mineral except the silex, which weighe 6 grs. From 
the muriatic solution carbonate of ammonia cheese down the 
the aluenine, estimated at 0.15 or. The ammoniacal solu- 
tion contained the magnesia and oxide of manganese. This 
solution was evaporated, and the ammoniacal salts were 
separated by letra the magnesia and manganese 
remained. The e then converted to sulphates ; the 
solution erioresed to “dati and the dry mass was kept 
at a red heat for halfan hour. The water was thus driven 
off from the sulphate of magnesia, and the sulphate of man- 
ganese being converted to the deutoxide of manganese, a red- 
dish powder was thus diffused through the sulphate of magne- 
sia. The whole weighed 87.5 grs. and dissolved in water 
except one grain of deutoxide of manganese, equivalent to 
1,1 gr. of the peroxide. This contained, therefore, 86.5 grs. 
for the sulphate of magnesia, equivalent to 28.83 grs, of pure 
magnesia. The result is, 
Water - - 15.00 grs 
Silex - - - 50 
Oxide of iron - 2.59 
Magnesia : 28.83 
Oxide of RARER NEES, 1.10 
“igri - 0.15. 
Loss {ee ee ee = 
“100.00 
This result contains a proportion of ingredients between 
those given by Klaproth in his analysis of steatite from two 
different places. There can be no doubt, therefore, that 
these crystals are real steatete. 
The form of some of these crystals, is that of a six-sided 
rism terminated by six-sided pyramids. often variously 
truncated. Some of them appear to be four-sided prisms 
terminated by a four-sided py ees aed are unques= 
tionably the crystals Intended by Jameson, as they are 
found ina similar situation to fia nigetieiaed by him, 
