430 
MINERALOGY: G. P. MERRILL 
Attention was also directed toward the possible occurrence of barium , 
strontium, and zirconium, particularly in the feldspathic forms. Only 
negative evidence was obtained. This is not regarded as conclusive, 
but the investigation was hampered by a paucity of material. 
Incidental to the work, a determined effort was made to ascertain to 
what of the minerals these minor constituents should be relegated. 
These results have thus far been only partially successful. It is evident 
that the platinum, palladium, and ruthenium, and perhaps the vanadium 
as well, are constituents of the metallic portions. The same is true of 
at least a part of the nickel and cobalt, although determinations made on 
the silicate portions, after most careful work to remove all of the native 
metal, still showed traces of both of these elements, indicating that they 
were also constituents of the pyroxenes or olivines as is often the case 
in terrestrial rocks. 
In attempting to ascertain the source of the phosphorus in the silicate 
portion, unexpected results were developed, the presence being shown of 
a phosphate of lime differing from normal apatite in being optically 
biaxial and with a somewhat lower index of refraction. This, together 
with the apparent widespread occurrence of the mineral oldhamite, a 
sulphide of calcium, as indicated by aqueous solutions, has been made the 
subject of a special paper in the May number of these Proceedings. 
A table comprising fifty-nine selected analyses of stony meteorites 
was given, twelve of which were made during the course of the investi- 
gations here being considered, others being taken from published de- 
scriptions by other workers. This table, too large for reproduction 
here, will appear with the extended report in some future publication. 
The average composition of the stony meteorites, as shown by fifty- 
three of the analyses, is given in column I of the following table. In 
column II is shown, for purposes of comparison, the average composition 
of the terrestrial lithosphere as given by F. W. Clarke, while in columns 
III and IV are the meteoric averages presented in previous papers by 
the author and Dr. O. C. Farrington respectively. 
SiOa.. 
Ti02. 
Sn02. 
Zr02. 
AI2O3. 
Fe203 
CrzOs 
V2O3. 
Fe... 
Ni... 
Co... 
38.68 
0.181 
none 
II 
59.85 
0.73 
38.732 
III 
IV 
39.12 
0.02 
0.02 
trace 
11.98 
1.153 
0.074 
none 
2.88 
0.472 
0.03 
14.87 
2.63 
0.05 
0.02 
2.7333 
2.62 
0.38 
0.41 
11.536 
11.46 
1.15 
0.05 
