Analysis of the New-Jersey Ores of Zine. 325 
_ There were heated at the same temperature, in a cruci- 
ble “ brasqué,”’ 
franklinite, - - - - 10 gr. 
silex, - - - - - - 4 
alumine, - - - - - 1.50 
lime, - - - = - - 1.40 
BISGit.al vps Siveessiyiso Crane ois ieee wal GLOO 
There was obtained a button, weighing 12.77 
Loss, - - - - - - - - + 4.13 
which was owing to the volatilized zinc, the oxigen of the 
iron, &c. 
The fusion was perfect; the metallic button weighed 
g4. 63; it flattened under the hammer, and the fracture was 
granular, and of various shades. ‘The scoria was compact, 
vitreous, transparent and green; it weighed 8.17 
Substract from it - - - - - - 6.90 
There remains - - - - - - - 1.27 
which represents the oxid of manganese that it contains. 
The ¢4. 6 of the “ fonte” correspond almost exactly with 
the 0.66 of the peroxid of iron discovered by analysis ; the 
metallic button ought to contain a little manganese, in the 
state of an alloy. 
The alloy obtained in the first trial, ought then to be com- 
posed nearly of 
Iron, - - - - 4.60 at most, - - - 0.814 
_ Manganese, - - 1.05 at least, - - - 0.186 
5.65 1.000 
Lastly, on melting in a crucible ‘‘ brasqué” a mixture of 
peroxid of iron, red oxid of manganese, and oxid of zinc in 
the same proportions as in the franklinite, a button was ob- 
tained, precisely similar to that of the first trial. It is obvi- 
ous then that the analysis of the franklinite can be per- 
formed both in the dry and humid way. The results by 
the dry way favour the opinion that in the analysis in the 
humid way, there is a loss of some portion of the zinc. 
The minerals of New-Jersey may be advantageously 
turned to account in various ways. By assorting into one 
collection, the pieces in which the red mineral prevails, ané ~ 
Vou. I.....No. 2. 42 
