286 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. [no. 228. 
11. BEAVER CREEK, BRITISH COLUMBIA. 
Fell May 26, 1893, near Beaver Creek, West Kootenai district. 
Described by Howell, Hillebrand, and Merrill in Amer. Journ. Sci.] 
3d series, vol. IT, p. 430. 
( 'omposition of the mass. 
Nickel-iron - - 17.13 
Magnetite - 16 
Troilite 5. 05 
Soluble silicates and phosphate 37. 23 
Insoluble silicates and chromite 40. 43 
100. 00 
According to Merrill, the silicates visible are olivine, enstatite, 
probably a little plagioclase, and some glassy base. 
Analyses by W. F. Hillebrand, record No. 1444. 
A. Nickel-iron. 
B. Nonmagnetic, stony portion. 
C. Portion of B soluble in hydrochloric acid, calculated to 100 per 
cent. 
D. Insoluble portion, calculated to 100 per cent. From C and D 
troilite and chromite are excluded. The chromite forms about 0.75 
per cent of the stony matter. 
Fe 
Ni 
Co 
Cu 
90. 68 
8.80 
.49 
.03 
100. 00 
Si0 2 
Ti0 2 .... 
A1A---- 
CrA- — 
FeO..... 
Fe 
NiO 
MnO 
CaO 
MgO .... 
K 2 
Na 2 . . . . 
H 2 
PA ---- 
s 
CI 
Troilite.. 
Chromite 
B. 
45.87 
.09 
2.30 
.51 
12.68 
3.87 
.07 
.26 
1.96 
28.24 
.15 
.98 
.34 
.30 
2.21 
trace 
38. 26 
56 
19.52 
.09 
.27 
1.03 
38.74 
.02 
.13 
.70 
.68 
57.75 
.18 
4.89 
i. 02 
trace 
.35 
3.44 
23. 19 
.25 
1.87 
.06 
trace 
99.83 100.00 100.00 
6. 08 
.75 
