Anulysis of the New-Jersey Ores of Line. 323 
come, between the oxid of zinc and the oxid of manganese, 
did not depend upon the intervention of any undiscover- 
ed substances, I dissolved pure oxid of zinc with the tenth 
part of its weight of oxid of manganese, equally pure, and 
heated the solution by the process described under No. 2. 
I obtained, as in the case of the American mineral, an ace- 
tous solution, with which the alkaline carbonates formed a 
precipitate, that became, in consequence of calcination, of 
a dirty yellow, and contained manganese. 
Hl. The black zinciferous mineral, the Franklinite. 
‘This mineral is composed of the oxid of iron, the oxid of 
manganese and the oxid of zinc. The association of these 
three oxids has never been before observed, and there is 
every reason to suppose that it constitutes a true species ; 
but although it shall be discovered hereafter that these ox- 
ids are merely mixed, which appears very improbable, 
this mixture wil appear too remarkable not to be denoted 
always by a name. As the chemical nomenclature cannot 
in every instance furnish a name, I propose to give it that 
of the Franklinite, derived from Franklin, in order to re- 
mind us that it was found, for the first time, in a place to 
which the Americans have given the name of a great man, 
whose memory is venerated equally in Europe as in the 
new world by all the friends of science and humanity. 
The appearance of this mineral is much like that of the 
fer oxidule (magnetic iron.) It is of a metallic black, is 
magnetic but without magnetic polarity ; it occurs in grains, 
or in amorphous masses which sometimes. present crystal- 
line faces, but they are small and of rare occurrence, and do 
not enable us to determine the geometrical forms to which 
they belong ; the fracture is either uneven or conchoidal, or 
imperfectly lamellar; it is not very hard; the powder is of 
a deep red brown, which distinguishes it from the magnetic 
iron whose powder is black. The specific gravity is 4,87. 
It is scarcely affected by the muriatic acid in the cold; 
but, by means of this acid, we can separate the carbonate of 
lime and the manganesian oxid of zine, with which it is al- 
most always mixed, and thus we can obtain it perfectly pure. 
It dissolves very easily in hot muriatic acid, without effer- 
vescence but with a slight smell of chlorine. The analysis 
