KEL.] 
CALIFORNIA. 
Analyses of travertine, clay, and cement. 
121 
Lica (Si0 2 ) 
umina (A1 2 3 ) 
m oxide (Fe 2 3 ) ... 
me (CaO) 
ignesia (MgO) 
kalies (K 2 0, Na 2 0). 
lphur trioxide (S0 3 ' 
rbon dioxide (C0 2 ) 
ater 
Travertine. Claj 
1.21 
.70 
.50 
53. 62 
.44 
.11 
42. 98 
58. 25 
18.56 
7.35 
3.10 
1.28 
2.35 
.45 
8. 55 
22. 25 
7. 65 
:;. 35 
62.85 
.78 
.69 
1 . 34 
1.00 
The Standard Portland Cement Company plant is located at Napa 
mction. Two grades of limestone are used as raw materials, one 
very clayey limestone, averaging about 60 per cent lime carbonate; 
e other a purer rock, carrying 85 per cent or more of lime carbonate, 
this respect the materials are closely similar to those used in the 
high district of Pennsylvania-New Jersey; but the California lime- 
>nes are much softer than those of the Lehigh region. Ten rotary 
Ins are in use, with Bakersfield oil for fuel. Analyses of the raw 
iterials follow: 
Analyses of raw materials of cement made at Napa Junction, (hi. 
ica(Si0 2 ) 
[imma(AUy 
n oxide (Fe 2 3 ) 
rue carbonate (CaC0 3 ) 
Lgnesium carbonate (MgC0 3 ) 
High-lime 
rock. 
7. 
12 
2. 
86 
1. 
16 
87. 
70 
84 
Low-lime 
rock. 
20. 87 
10. 50 
3. 50 
62.76 
1.48 
The plant of the California Portland Cement Company is located at 
•lton. The raw materials used are a pure, very highly crystalline 
aestone (marble), obtained near the plant, and clay shipped in from 
srris, 25 miles away. The limestone will range from 90 to 99 per 
nt lime carbonate; the clay is relatively low in silica and high in 
imina and iron oxide. Three rotary kilns are in operation, using 
m Angeles and Bakersfield oil for fuel. 
BIBLIOGRAPHY OF CEMENT RESOURCES OF CALIFORNIA. 
l,ler, J. S. Limestone of the Redding district, California,. Bulletin U. S. Geol. 
Survey No. 213, p. 365. 1903. 
imsley, G. P. The Portland cement industry in California. Eng. & Min. Jour., 
July 20, 1901. 
