CARBONATE ROCKS. 
26 
P. Ferrodolomite, Marquette district, Michigan. Analysis by 
George Steiger, record No. 1473. P. R. C. 994. 
Q. Ferrodolomite, Marquette district, Michigan. 
R. Portion of Q insoluble in hydrochloric acid. 
S. Soluble portion of Q. 
Analyses Q, R, and S by George Steiger, record No. 1442. These 
rocks are not in the monograph cited. 
p. 
Q. 
R. 
s. 
Si0 2 
42.37 
26.97 
1.30 
2. 31 
39.77 
.29 
.66 
1.94 
.09 
.10 
.51 
.03 
26.20 
26.67 
.12 
.16 
.30 
1.18 
2.15 
39.77 
.29 
.66 
1.84 
.09 
A1 2 3 
Fe 2 3 
1.09 
31.41 
FeO 
MnO 
CaO 
.50 
2.48 
MgO 
.10 
Alkalies 
H 2 at 100° 
H 2 above 100° . 
P 9 (\ 
.03 
26.20 
co 2 
21.80 
99.65 
100. 17 
27.05 
72.51 
