J. L. Smith—Coneretions in Meteoric Irons. 491 
Aragonite.—I first discovered carbonate of lime in small 
Hach of the concretions enumerated, in all six excluding the 
last, is almost as characteristic of meteoric iron as the nickel- 
iferous alloy of the metal. It is true that we find graphite 
Segregated in artificial iron from the blast furnace, but in this 
iron it is always in crystalline flakes, which I have not found 
Im meteoric iron. ‘ 
he above facts do not exhaust the interesting facts con- 
nected with these concretionary minerals of meteoric iron—for 
Some of them, if not the majority, are somewhat complex in 
their character, being mixtures of the various substances found 
in two or more of the purer nodules; and besides there are 
other compounds not visible to the naked eye and only reached 
by chemical means, I will describe some of them that are 
apm and give the method of separating the different com- 
pounds, 
- Before, however, passing to this part of the subject I will say 
a word about Célestialite, for, while it does not occur in a con- 
ereted form in any part of meteoric iron, it is found associated 
With the graphite, and also in the troilite containing graphite. 
A full description of it has already been given. . Berthelot 
has supposed that the ether used in the experiments had some- 
thing to do with its formation, but I have since repeated all my 
ormer experiments with petroleam ether in his presence with 
Similar results, 
here is also an undefined Cobalt mineral occurring in the 
troilite of some of the veins, which will be referred to beyond. 
Compound nodules.—The difficulty of obtaining a sufficient 
quantity of these concretions from many irons, t i : 
Scribed my research to those coming from three irons: Ist, the 
Only for a partial examination; 2d, the 1e 5 
the Sevier County—the latter two furnished the principal ma- 
terials for my research. 
I will simply detail my process with the results from the 
* This Journal, vol. xliii. + This Journal, vol. xii, 1876. 
+ This Journal, May and June, 1876. 
