CLARKE.] 
IGNEOUS AND CRYSTALLINE ROCKS. 
2i 
2. LITCHFIELDITE AND ASSOCIATED MINERALS. 
A. Elseolite-syenite, var. litchtieldite, f rom Litchfield. Described by 
Pay ley in Bull. 150, p. 201; and in Bull. Geol. Soc. Amor., vol. 3, p. 231. 
Contains ekeolite, two feldspars, and lepidomelane, with sodalite, can- 
crinite, and zircon as accessories. Analysis by L. G. Eakins, record 
No. 1298. P. R. C. 77. 
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 . 
A1 2 3 
Fe 2 3 
FeO. 
MgO 
CaO. 
Na 2 
K 2 0. 
H 2 0. 
MnO 
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. Elaeolite, dark gray. 
E. Hydronephelite. 
F. Lepidomelane. Contains no fluorine. 
D. 
E. 
F. 
Si0 2 
43.74 
34. 48 
38.99 
33.62 
32.09 
18.52 
19.49 
14. 10 
1.01 
ALO, 
Fe 2 3 
FeO 
MgO 
trace 
trace 
16.62 
4.55 
.86 
CaO 
.07 
13.07 
1.12 
12.98 
Na 2 
1.55 
8.12 
4.62 
1.42 
K 2 
H 2 
MnO 
100. 25 
99.85 
100.92 
