CLARKE.] 
IGNEOUS AND CRYSTALLINE ROCKS. 
33 
H. Rich, dark-green, serpentine, Rowe. 
I. Black serpentine, containing marmolite, A twater's quarry, Russell. 
J. Blackish-green serpentine, containing much chromite. From 
"The Crater," North Blandford. 
K. 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 Oatl00°... 
H 2 above 100 
Ti0 2 
P 2 5 
Cr 2 3 
MnO 
NiO 
CoO 
co 2 
B0 3 
FeS, 
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 
39. 14 
1. 18 
4.46 
3.14 
33. 87 
.77 
2.81 
4.25 
38.35 
41.45 
38.57 
none 
none 
none 
} 
none 
} 
none 
} 
none 
.71 
.34 
.38 
12.07 
9.48 
7.00 
trace 
none 
none 
trace 
.02 
trace 
.33 
.33 
.38 
trace 
none 
.04 
.40 
none 
.47 
trace 
} 
.33 
1.85 
none 
10.82 
.20 
none 
.20 
99.33 
LOO. 01 
99.42 
Bull. 228—04- 
