344 CEMENT MATERIALS AND INDUSTRY. Hull. 
Analyses of natural-cement rocks, Cumberland and Hancock, Md. 
Silica (Si0 2 ) 
Alumina ( A1 2 3 ) 
Iron oxide (Fe 2 3 ) 
Lime (CaO) 
Magnesia (MgO) 
Alkalies (Na 2 0,K 2 0).. 
Sulphur trioxide (S0 3 ) 
Carbon dioxide (C0 2 ) . 
Water 
1 
2 
3 
4 
19.81 
24.74 
| 27. 10 
f 28.72 
I 12.28 
7.35 
16.74 
2.41 
6.30 
1.50 
5.22 
35.76 
23.41 
36.40 
25.54 
2.18 
4.09 
2.52 
1.10 
n. d. 
6.18 
.30 
n. d. 
n.d. 
2.22 
n.d. 
1.53 
| 31. 74 
| 22.90 
I n. d. 
31. 38 
n. d. 
1 24. 40 
« Data insufficient for averaging. 
1. Hancock, Md. C. Richardson, analyst. Brickbuilder, July, 1897. 
2. Cumberland, Md. E. C. Bovnton, analyst. Quoted by Gillmore, Limes, Cements, and Mortal 
p. 125. 
3. Hancock, Md. C. Huse, analyst. Quoted by Gillmore. Ibid. 
4. Cumberland, Md. C. Richardson, analyst. Brickbuilder, July, 1897. 
5. Average of preceding four analyses. 
Analyses of natural cements, Cumberland and Hancock, Md. 
Silica (Si0 2 ) 
Alumina (A1 2 3 ) 
Iron oxide (Fe 2 3 ) . . . 
Lime (CaO) 
Magnesia (MgO) 
1 
2 
3 
4 
5 
6 
7 
25.70 
28.02 
28.30 
28. 36 
28.38 
30. 02 
36.60 
12.28 
10.20 
10.12 
k 9.85 
11.71 
13.55 
L4.58 
4.22 
s. so 
4.42 
3.07 
2.29 
3. 00 
5.12 
52.69 
44.48 
49.60 
45.04 
43.97 
44.58 
37. -50 
1.44 
1. 00 
3.76 
2.82 
2.21 
2.76 
2.73 
29. : 
LI. 3 
4.4 
45. -J 
9 t- 
1. Cumberland, Md. A. W. Dow, analyst. Mineral Industry, vol. 0, p. 96. 
2. Hancock, Md. Quoted by Cummings, American Cements, p. 36. 
3. Cumberland, Md. A. W. Dow, analyst. Mineral Industry, vol. 6, p. 96. 
4. Hancock, Md. A. W. Dow, analyst, Ibid. 
5. Cumberland, Md. Quoted by Cummings, American Cements, p. 36. 
6. Hancock, Md. A. W. Dow, analyst. Mineral Industry, vol. 6, p. 96. 
7. Cumberland, Md. A. W. Dow, analyst. Ibid. 
8. Average of preceding seven analyses. 
NATURAL-CEMENT RESOURCES OF MINNESOTA. 
Two natural-cement plants are in operation in Minnesota. One o 
them is located at Mankato, Blue Earth County, and uses a limeston 
of Lower Magnesian (Ordovician) age. The following analyses of th 
raw material used at this plant have been published: 
Analyses of natural-cement rock from Mankato, Minn. 
Silica (Si0 2 ) 
Alumina ( A1 2 3 ) 
Iron oxide (Fe 2 3 ) 
Lime (CaO) 
Magnesia (MgO) 
Alkalies (K 2 0,Na 2 0).. 
Sulphur trioxide (S0 3 ) 
Carbon dioxide (C0 2 ) . 
1 
2 
3 
4 
5 
16.00 
12.14 
10. 10 
16.80 
8.90 
5.85 
4.62 
2.78 
8.76 
3.30 
2.73 
1.84 
1. 34 
Tr. 
1.02 
22.40 
22.66 
25.96 
22.20 
24. 85 
14.99 
16.84 
14.91 
11.99 
18.49 
.76 
3. 52 
3. 50 
4.75 
1.53 
n. d. 
.13 
.26 
. 22 
.18 
34. 11 
39.07 
41. 29 
35.90 
41.80 
11.8 
3. 4 
Ti| 
24. 6 \ 
L6.6 
2. 5 
.2 
40.8 
I.e. P. Sidener, analyst. Eleventh Ann. Rept. Minn. < teol. Survey, p. 179. 
2-6. Clifford Richardson, analyst. Cement Directory, p. 206. 
