333 
JDr Turner’s Analysis of Radiated C destine. 
The fresh celestine is therefore composed of 
Sulphuric Acid, 
1.6924 
per cent. 
41.431 
Baryta, *- • ■* 
0.5502 
13.469 
Strontian, 
1.817 
44.481 
Lime, 
0.007 
0.171 
Protoxide of Iron, . • 
9 ©' 
0.168 
Deutoxide of Manganese, 
a • 
. 0.15 
4.0566 
99.870 
Considering the sulphates of strontian and barytes to be the 
essential compound, the mineral is composed of 
Sulphate of Strontian, : . • 78.205 
Sulphate of Baryta, . . . 20.41 
Supposing it to be a compound of one atom of the sulphate of 
baryta, with five atoms of the sulphate of strontian, it would be 
composed of 
Sulphate of Strontian, . . . 79-09 
Sulphate of Baryta, • . . 20.41 
The crystalline nature of this mineral, and its homogeneous 
aspect, lead to the presumption that it is a definite compound 
of the sulphates of baryta and strontian. The weathered variety, 
on the contrary, can only be regarded as a disintegrated mine- 
ral, and must be variable in the proportion of its constituents, 
according as the process of disintegration is more or less ad- 
vanced. X have seen specimens in all stages of decomposition, 
from its commencement, when the mineral was firm, and only 
stained with the subsalt of iron, till it was so friable as to fall 
into a powder from the least touch. A weathered portion has 
frequently a firm nucleus within, which has undergone hardly 
any change. 
The specific gravity of the weathered celestine is much less 
than that of the fresh variety. The former has lost all its lustre, 
and is quite opaque. Some parts are very white, while others 
are strongly stained with iron. All the specimens I examined 
uniformly effloresced with muriatic acid, which the fresh mineral 
did not ; carbonic acid was disengaged, and a muriate of lime 
was formed. The carbonate of lime must have been deposited 
by water, for it pervaded the mass irregularly, some portions, 
even from the same specimen, containing more than others. A 
very pure looking and completely disintegrated specimen, given 
