CLARKE.] 
CARBONATE BOCKS'. 
SOUTH DAKOTA. 
321 
A. Purple limestone, east of Cascade, Black Hills. Collected by 
G. B. Richardson. Analysis by George Steiger, record No. 1854. 
B. Dolomite from the Tornado mine, Black Hills. Received from 
S. F. Emmons. Analysis by W. F. Hillebrand, record No. 1866. 
A. 
B. 
Si0 2 . * 
1.12 
| «. 36 
19.85 
31.51 
none 
none 
.07 
1.18 
45.66 
5.74 
A1 2 3 
2.02 
Fe 2 3 
.64 
FeO 
6.47 
MgO 
14.75 
CaO 
26. 81 
Na 2 
.07 
K 2 - 
.53 
H 2 Oatl05° 
.34 
H 2 above 105° 
.67 
C0 2 
40.11 
P,Oc - 
.08 
S0 3 .' 
.07 
FeS 2 
.69 
MnO 
none 
.97 
99.82 
99.89 
a Includes possible Ti0 2 , P 2 5 , and Fe. 
Bull. 228—04- 
-21 
