GEOLOGICAL SOCIETY OF DUBLIN. 
69 
If we deduct the iron, water, skeleton, &c., and calculate the rela¬ 
tive proportions of carbonate of lime, and of carbonate of magnesia in 
100 parts of the mixed carbonates, we obtain the following results:— 
Carbonate of lime,. 58*660 
Do. magnesia,.41*339 
99*999 
True dolomite, or CaO, C0 2 +MgO, C0 2 would give the following 
composition in 100 parts :— 
Carbonate of lime,. 54*201 
Do. magnesia,. 45*798 
99*999 
The mineral analyzed may, therefore, be considered as a mixture of 
dolomite and calcite in the following proportions :— 
CaO, C0 2 + MgO, C0 2 ,. 90*262 
CaO, C0 2 ,. 9*738 
100*000 
The insoluble skeleton, when dried, had the appearance of an asbes- 
tiform Tremolite, and its analysis gave the following result:— 
Silica,.68*181 
Magnesia,. 28*909 
Alumina and traces of iron, . . . 2*181 
99*271 
It is probable, therefore, that this skeleton was Tremolite, from which 
water impregnated with carbonic acid had removed the whole of the 
lime. Thus, if we deduct the per centage of lime, and calculate the 
remaining numbers in 100 parts in the analysis specimen of Tremolite 
from Wermland, made by Bonsdorff, and compare the results with the 
preceding analysis of the skeleton, we shall get the following numbers:— 
Tremolite from Wermland, 
analyzed fey Bonsdorff. 
Tremolite, supposing 
the whole of the 
lime removed. 
Asbestiform 
skeleton. 
Silica,. 
59*75 
. . 69*565 . 
. 68*181 
Lime,. 
14*11 
Magnesia, . . . , 
Protoxide of iron, 
25*00 
0*50 
. . 29*107 . 
. . 0*582 
. 28*909 
Fluorine, .... 
0*94 
. . 1*094 
Water,. 
0*10 
. . 0*116 
100*40 
100*464 
VOL. V.-PEOC. SOC. L 
