CLARKE.] 
IGNEOUS AND CRYSTALLINE ROCKS. 
29 
E. Rich, dark-green serpentine, Rowe. 
F. Black serpentine containing marmolite, Atwater's quarry, Russeil. 
G. Blackish-green serpentine containing much chromite. From 
"The Crater," North Blandford. 
H. Gray, splintery serpentine, Chester. 
Analyses by Steiger, record No. 1536. 
Si0 2 
A1 2 3 
Fe 2 3 
FeO 
MgO 
CaO 
Na 2 
K 2 
H 2 at 100° . . 
H 2 above 100 
Ti0 2 
PA 
Cr 2 3 .... 
MnO ......... 
NiO 
CoO .......... 
co 2 ........... 
so 3 ......... 
FeS 9 
40.42 
1.86 
2.75 
4.27 
35. 95 
.66 
.16 
.21 
10. 51 
none 
trace 
.28 
trace 
.53 
trace 
1.44 
trace 
.43 
99.47 
36.94 
.50 
6.04 
1.94 
38.35 
none 
none 
.71 
12.07 
trace 
trace 
.33 
trace 
.40 
none 
1.85 
.20 
G. 
39. 14 
1.18 
4. 40 
3.14 
41. 45 
none 
none 
99. 33 
100. 01 
33.87 
.77 
2.81 
4.25 
38.57 
none 
none 
.34 
.38 
9.48 
7.00 
none 
none 
.02 
trace 
.33 
.38 
none 
.04 
.47 
trace 
none 
none 
} 
.33 
10.82 
.20 
99. 42 
