ECKRL. ] 
NEW YOEK. 
347 
Analyses of natural cements, Rosendale district, New York. 
Number. 
Silica 
(Si0 2 ). 
Alumina 
(Al 2 3 ). 
Iron 
oxide 
( Fe 2 3 ). 
Lime 
(CaO). 
Mag- 
nesia 
(MgO). 
Alkalies 
(K 2 0, 
Na.,0). 
Sulphur 
tiioxide 
(S0 3 ). 
Carbon 
dioxide 
(CO,). 
Water. 
1 
2 
25.91 
27.98 
24.30 
27. 75 
30. si 
29.00 
30. 50 
24.42 
22.77 
17.17 
21. 73 
27. 30 
29.98 
22. 75 
28.87 
6.20 
7.28 
7.22 
5. 50 
7.75 
10. 
6.84 
8.16 
10. 
3.81 
1.70 
5.06 
4.28 
2.11 
40- 
2.42 
3.96 
43 
34. 62 
37. 59 
33. 70 
35. 61 
34. 49 
32. 35 
34.38 
36. 30 
34. 54 
48.28 
33.77 
35. 98 
33.23 
37.60 
35. 89 
20.92 
15.00 
20.94 
21. 18 
17. 77 
19. 92 
18.00 
16. 93 
21.85 
19.13 
21.20 
18.00 
17.80 
16.65 
18.95 
n. d. 
7. 96 
n. d. 
Tr. 
4.00 
n. d. 
3. 98 
n. d. 
3.63 
Tr. 
2.99 
6.80 
7.10 
n. d. 
n. d. 
n. d. 
n. d. 
0.50 
n. d. 
n. d. 
n. d. 
n. d. 
1.44 
1. 20 
n. d. 
n. d. 
n. d. 
n. d. 
5.09 
2. 
n. d. 
4.05 
2.80 
49 
3 ... 
n. d. 
4 
n. d. 
5 
3.04 
6 
7 
8 
9. 
n. d. 
3. 
n. d. 
2.84 
3.38 
n. d. 
n. d. 
78 
n. d. 
1.59 
10 
10. 80 
n. d. 
11 
11. 18 
7.14 
6.88 
13.40 
7.96 
4.14 
1.80 
2.50 
3.30 
3.19 
n. d. 
12 
2.98 
13 
14... 
15 
3. 
5.00 
13 
1.36 
"F. O. Norton." Private communication. 
" F. O. Norton." Cummings, American Cements, p. 35. 
"F. O. Norton." Lewis, Mineral Industry, vol. 6, p. 96. 
Beach's. J. O. Hargrove, analyst: Private communication. 
Brooklyn Bridge. Cummings, American Cements, p. 35. 
Lawrenceville. A. W. Dow, analyst. Mineral Industry, vol. 6, p. 90. 
Newark Lime and Cement Company. Cummings. American Cements, p. 35. 
"Old Newark." Booth, Garrett & Blair, analysts. Mineral Industry, vol. li, p. 96. 
'• Lawrence," Rosendale Cement Company. Mineral Resources United States for 1883-4. 
Lawrence Cement Company/ Ibid, (very exceptional analysis). 
Lawrence Cement Company. Haas & McGravv, analysts, Engineering News, April 
Hoffman," 
Hoffman," 
30, L896. 
Hoffman," 
Lawrence Cement Company. Cummings, American Cements, p. 35. 
" Rock Lock." Cummings. Ibid. 
Rondout. L. C. Beck, analyst. Mineralogy of New York," p. 78. 
Average of preceding fourteen analyses. 
HOWES CAVE. 
In the region north and northwest of the Rosendale-Rondout district 
no natural cement plants are to be found until Schoharie County is 
reached. Here, at Howes Cave, a single plant has long been engaged 
in the manufacture of cement from a 7-foot bed of rock. 
Analyses of natural cement rock, Schoharie County, N. Y. 
Silica (Si0 2 ) 
Alumina (A1 2 3 ) 
Iron oxide (Fe. 2 C\) . . . 
Lime (CaO) 
Magnesia (MgO) 
Carbon dioxide (C0 2 ) 
12. 89 
11. 15 
30. 90 
9.38 
34. 60 
9.92 
n. d. 
ii. d. 
38.26 
9.00 
39. 96 
11.50 
1.50 
31. 75 
14.91 
40.34 
1. Bottom of cement bed, Howes Cave. C. O. Schaeffer, analyst. Eighteenth Ann. Rept. N. Y. 
State Geologist, p. 69. 
2. Top of cement bed, Howes Cave. C. O. Schaeffer, analyst. Eighteenth Ann. Rept. N. Y. State 
Geologist, p. 69. 
3. Howes Cave. L. C. Beck, analyst. " Mineralogy of New York," p. 79. 
