14 M. Rose on tlie Pyroxenes, 
M. Arfwedson considers the muriatic acid as essential to the 
composition of this stone. He thinks it probable that it may con- 
tain one atom of a double subsilicate of soda and alumine, com- 
bined with four atoms of the combination which constitutes 
Nepheline, that is (N^M+^A^M) + 4 (NS-f-3AS) 
4. Researches respecting the Pyroxenes^ &c. by M. Henry Rose. 
We have already communicated to you (See this Journal, 
vol. iv. p. 21.) the general result of the great work of M. Rose 
on the pyroxenes, viz. that these stones are bi-silicates, some- 
times double, and sometimes only mixed with four bases, viz. 
lime, magnesia, the protoxide of iron, and the protoxide of 
manganese. We shall now give you the numerical results of 
all M. Rose’s analyses, from which you will see that in every 
case the silex contains twice as much oxygen as the bases to- 
gether. 
Analyses of the Pyroxenes or Malacolites. 
Localities of 
the Minerals. 
Orijasri, in Fin- 
land. 
Sala, in Swe- 
den. 
Bjornmyres- 
veden. 
Ditto, another 
Variety. 
Taberg, in Wer- 
meland. 
Tunaberg, (the 
Hedenhergite.) 
1 
bJO 
c 
OS 
[ Do, do. Oxyde 
1 de Manganese 
1 Silicifere, H. 
Degero, in Fin- 
1 land. 
1 Tjotten, in Nor- 
1 way. 
Authors of 
the Analyses. 
Rose. 
Rose. 
Rose. 
Rose. 
Rose. 
Rose. 
Rose. 
Berze 
lius* 
Berze- 
lius. 
Count 
Wacht- 
meister. 
Silex, 
Lime, 
Magnesia, - 
Protoxide of ) 
Iron, f 
Protoxide of | 
Manganese, j 
Alumine, - 
54.64 
24.94 
18.00 
1.08 
2.00 
0. 
54.86 
23.57 
16.49 
4.44 
0.42 
0,21 
54.55 
20.21 
15.25 
8.14 
0.73 
0.14 
54.08 
23.47 
11.49 
10.02 
0.61 
53.36 
22.19 
4.99 
17.38 
0.09 
49,01 
20.87 
2.98 
26.08 
Traces. 
55.32 
23.01 
16.99 
2.16 
1.59 
48.00 
3.12 
0.22 
Traces. 
49.04 
50.0 
20.0 
4.5 
19.0 
3.0 
0.9 
Loss in 
Fire. 
57.11 
24.94 
16.76 
0.20 
0.436 
Total, - 
100,66 
99.99 
99.02 
99.67 
98.01 
98.94 
99.07 
100.38 
97.4 
99.45 
M. Rose has also analysed the Analcime, He finds that it 
contains the same combination as the Amphigerie, or LeucitCy 
with this diiference only that it contains soda, whereas the amphi- 
