MINERAL CONSTITUENTS OE METEORITES. 
197 
Undissolved silicate . . . 
Octahedra (Osbornite) . . 
Dissolved silicate (enstatite). 
Residuary magnesium (as mag- 
nesium monosulphide) . . 
Calcium monosulphide . . 
Calcium sulphate (gypsum) . 
Calcium carbonate .... 
Iron sulphide (Troilite) . . 
Iron (probably metallic) . . 
Table I. 
I. 
7-644 
0-277 
SiO 
. 1-159 
1-525 
Mg . 
. 0-366 J 
Mg . 
. 1-257 

„ \ 2-933 
. 1-676 J 
S . 
S . 
. 35-888 ' 
■ 80-748 
Ca . 
. 44-860 J 
Ca . 
. 0-830 i 
S0 4 
. 1-993 
- 3-570 
(H 2 0 
. 0-747) J 
Ca . 
(co 3 
. 1-241 
- 3-102 
. 1-861) 
Fe . 
0-507 
100-306 
II. 
8-456 
0-875 | 
0- 276] 
1- 229 | 
1-638 J 
0- 297 
1- 151 
2- 867 
35-227 | 
44-034 J 
0-856 
2-054 
0-770 
79-261 
3-680 
1-288 | 
0-736 J 
2-024 
0-261 
97-997 
The dissolved silicate, as will be seen in the sequel, is most likely to be enstatite, that 
mineral being the more soluble of the two silicates in which the Oldhamite is imbedded. 
That a portion of the magnesium is present as sulphide is a necessary conclusion from 
the proportions of sulphur and of metal in the spherules. I have assumed the sulphuric 
acid to correspond to the ordinary hydrated calcium sulphate (gypsum), and the resi- 
duary calcium in analysis I. to be present as calcium carbonate. The result of this 
interpretation of the above analyses is that, if we deduct the silicates encrusting the 
Oldhamite together with the Osbornite and the iron that the spherules contain, we have 
the following composition for these spherules and their oxidised coating. 
Table II. 
I. 
Oldhamite . . ■ 
Calcium monosulphide . . . 
80-748 
per cent. 
89-369 
. Magnesium monosulphide . . 
2-933 
3-246 
- Gypsum 
3-570 
3-951 
Incrustation . . - 
Calcium carbonate .... 
3-102 
3-434 
. Troilite 
904353 
100-000 
II. 
per cent. 
79-261 
90-244 
2-867 
3-264 
3-680 
4-189 
2-024 
2-303 
87-832 
100-000 
The magnesium sulphide may be looked on either as a mechanically mixed ingredient 
or as a constituent of the Oldhamite*. 
The existence of either of these substances in a meteorite serves to prove that the con- 
* In the second analysis the deficiency in the percentage may have been due to some small error in the de- 
termination of the lime ; and any such small error, where the quantity of the mineral disposable for the analysis 
is so minute, becomes magnified considerably on calculating the percentage results. 
2 D 
MDCCCLXX. 
