330 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. [no. 228. 
i. RICO DISTRICT. 
Limestone described by Ransome in 22d Ann., Part II. Analyses 
by W. F. Hillebrand, record No. 1914. 
A. From Forest-Payroll mine. 
B. Alteration product of A. 
C. From Nellie Bly mine. 
A. 
B. 
c. 
SiOg 
23. 51 
1.56 
.30 
. 56 
2. 29 
39. ir, 
? 
.51 
.66 
.06 
a 30. 86 
trace 
29.29 
12.56 
j 5. 36 
14.21 
1.06 
.20 
7,33 
aS, 88 
.27 
.17 
.14 
trace 
.80 
.04 
.07 
.10 
.25 
55. 10 
Al.,( )., 
Fe,0„ 
FeO 
MsrO 
CaO 
Alkalies 
H 2 at 1 05° 
II„< ) above 105° 
TiO, 
trace 
CO , 
"43.39 
P,O r 
nutlet. 
so 3 
S 
t race 
MnO 
.54 
.13 
Mn0 2 
13.27 
trace 
trace 
1. 65 
.40 
5.21 
BaO 
trace 
none 
Li.,0 
ZnO 
trace 
trace 
.09 
CuO 
.03 
PbO 
100.00 
100. 00 
100. 00 
'i By difference. 
