Chemical Examination of American Minerals. 4 1 

 The constituents of this mineral were found to be, 



Peroxide of iron, ------ 75*5 



Deutoxide of manganese, _ - _ - 22*65 



Titanic acid, and peroxide of iron, - - 1*15 



Moisture, 0-40 



99-70 



These constituents are not in atomic proportions. They 

 approach, 



3 atoms peroxide of iron, 



1 atom deutoxide of manganese. 



But there is an excess of peroxide of iron, amounting to 

 rather more than one third of an atom. 



This ore differs much in its appearance from oligist iron 

 ore. It certainly constitutes a new species of iron ore. 



11. BUCHOLZiTE. 



The lirst account of this mineral appeared in the 25th vol- 

 ume of the first series of Schweigger's Journal for the year 

 1819, written by Dr. Brandes. He had obtained the spe- 

 cimen which he examined, from Professor Weiss; and its lo- 

 cality was the Tyrolese Alps. Brandes gives a chemical 

 analysis of this mineral, together with a very imperfect de- 

 scription of it ; and I have seen no farther account of it in 

 any subsequent publication. About two years ago, Mr. Nuttall 

 sent me some specimens of American minerals, among which 

 was one from Chester, on the Delaware, south-west from Phi- 

 ladelphia, which, on the authority of Mr. Heuland, he called 

 Bucholzite. Being small and not very pure, I did not think 

 it worth while to analyze it. But about a year ago he sent 

 me some other specimens, which were larger, and one of 

 ihem appeared sufficiently pure for examination. 



Vol,. IIL r, 



