THE NOCOLECHE METEORITE— COOKSEY. 
53 
sulphuretted hydrogen. The remaining portion of iron was then 
thrown down by making the solution alkaline with ammonia. 
II. 3 0086 grams were separately dissolved in a mixture of 
nitric and hydrochloric acids to estimate the sulphur and phos- 
phorus. 
III. 2 5045 grams were dissolved in hydrochloric acid, the 
residue and copper separated, the filtrate made up to 500 cc., and 
50 cc, of this taken to estimate the iron, nickel, and cobalt. The 
iron was separated from the nickel by precipitation with ammonia. 
T V. A small piece of very bright iron, shewing brilliant cleavage 
surfaces, and weighing *3733 gram, was analysed for iron. It 
was obtained from the vicinity of a troilite nodule. 
I. 
n. 
111. 
IV. 
Residue ... 
■09 
■07 
Copper . . . 
•07 
■03 
Iron 
... 97-09 
96-65 
97-05 
Nickel ... 
2-91 
| 3*69 
Cobalt ... 
•21 
Phosphorus 
•12 
Sulphur ... 
100-37 
•11 
100-44 
The iron is active towards acids and sulphate of copper. 
Troilite. 
The material for analysis was obtained from a nodule, the 
specific gravities of two pieces of which, weighing *3746 gram, 
and 1*3704 grams, were found to be respectively 5*50 and 5*442. 
On powdering and treating with a concentrated solution of sul- 
phate of copper, a copious precipitate of metallic copper was 
very quickly formed. To remove all the iron the powder was 
boiled with a concentrated solution of sulphate of copper for a 
quarter of an hour A' A black product was finally obtained after 
washing, which had a specific gravity of 4*66, and was found to 
be sulphide of copper containing only 6*94 per cent, of iron. An 
attempt was then made to separate the troilite from impurities 
by repeatedly washing and separating the lighter and heavier 
portions. A product was in this manner obtained which curiously 
had a specific gravity of 4*788, but on analysis was found to con- 
tain 20*32 per cent, of sulphur and 73*49 per cent, of iron. The 
iron must therefore be intimately mixed with the troilite. It was 
finally ascertained that the iron could be removed by standing 
for some hours with a solution of either sulphate of copper or 
# Stanislas Meunier, Encyclopedie chimique, ii., 1884, App. 2 , Meteor- 
ites, p. 57 ; W. Crookes, Select Methods in Chemical Analysis, 1886, p. 201. 
