24 
ANALYSES OF ROCKS, TJ. S. GEOLOGICAL SURVEY, 
[no. 228. 
2. LITCHFIELDITE AND ASSOCIATED MINERALS. 
A. Elseolite-syenite, var. litchfieldite, from Litchfield. JVordmark- 
ose. Described by Bayley in Bull. 150, p. 201; and in Bull. Geol. 
Soc. Amer., vol. 3, p. 231. Contains elseolite, two feldspars, and 
lepidomelane, with sodalite, cancrinite, and zircon as accessories. 
Analysis by L. G. Eakins, record No. 1298. P. R. C. 77 and 949. 
B. Albite from A. Sp. gr., 2.622. 
C. Potash feldspar from A. Sp. gr., 2.56. Analyses B and C by 
W. H. Melville, record No. 1275. P. R. C. 77. 
Si0 2 . 
ALA 
Fe 2 0< 
FeO. 
MgO 
CaO. 
Na 2 
K 2 0_ 
H 2 0. 
MnO 
A. 
60.39 
22.57 
.42 
2.26 
.13 
.32 
8.44 
4.77 
.57 
.08 
99. 95 
B. 
68.28 
19.62 
.23 
.09 
.31 
10. 81 
.39 
.09 
99.82 
65. 14 
18.19 
.25 
.16 
.33 
1.68 
14.14 
.17 
100. 06 
The minerals found in this rock were quite fully described by Clarke 
in Bull. 42, pp. 28-38. Analyses by F. W. Clarke. 
D. Eleeolite, dark gray. 
E. Hydronephelite. 
F. Lepidomelane. Contains no fluorine. 
D. 
E. 
F. 
Si0 2 
43.74 
34.48 
38.99 
33.62 
32 09 
A1 2 3 
18.52 
19 49 
Fe 2 3 
FeO 
14 10 
MgO 
trace 
trace 
16.62 
4.55 
.86 
.07 
13.07 
1.12 
12.98 
1 01 
CaO 
Na 2 
1.55 
8.12 
4.62 
1.42 
K 2 
H 2 
MnC ... 
100. 25 
99.85 
100. 92 
