Analysis of the New-Jersey Ores of Zine. 319 
Art. XVI. Analysis of two Zine Ores from the United 
_ States of America ; by M. P. Berruier, Engineer in 
the royal Corps of Mines, (translated by the Editor from 
the Annales des Mines 3d Livraison Ann. 1819.*) 
TueEse two minerals occur together and are very abun- 
dant. They compose the ‘principal part of a very thick 
and extensive metalliferous bed contained in a grauwacke 
formation in New-Jersey. ey occur principally in 
Franklin, Sparta, Stirling, Rutgers, in the county of Sus- 
sex : they are accompanied by white laminated carbonate 
of lime, quartz, a peculiar greenish yellow garnet, and some 
other substances. One of these minerals (the zine ores) 
is orange red, the other is of a metallic black. We will 
examine them successively. . 
1. The Manganesian Ord of Zinc, 
It is to Bruce that we owe the knowledge of the red 
mineral.| In 1814, he published a description and analy- 
sis of it in the American Journal, (vol. 1, page 96:) he 
found it composed o 
Oxid of zinc, - - - - - = 0.92 
Oxid of manganese and iron, - 0.08 _ 
It was named from its composition manganesian oxid of 
zinc. I have subjected this ore to many trials, and have 
repeated the analysis in many forms; like Bruce, I have 
found only oxid of zine and oxid of manganese, but in pro- 
portions a little different from his, as will appear below. 
The manganesian oxid of zinc is of an orange red, ap- 
proaching blood red. It is in amorphous grains irregularly 
disseminated in the mass of the mineral: the fracture is 
ae 
* The importance of these two ores, and respect to the memory of the 
late Dr. Bruce, who first made these ores known, have induced me to give 
the memoir entire.—-Editor. 
t Mr. Maclure had already, in 1811, transmitted the New-Jersey mineral 
to M. Vauquelin, who extracted faom it 
rotoxid of iron, - - - - - - 045 
Oxid of zinc, about - - - - - ~- 0.50 
A toxid of manganese, - - - 0.05 
but it appears that this analysis was the result of a simple trial made upon 
the mixed mineral. 
