Analysis of American Spathic Iron and Bronzite. 171 



" This ore is one of great value, and nothing prevents its being 

 heated in the ordinary high furnace. The magnesia is rather abun- 

 dant, and I perceived on the specimen small portions of sulphuret of 

 iron. Nothing has a more deleterious effect upon iron than sulphur, 

 and if it were present in considerable quantities, it would most cer- 



tainly injure the qualities of the iron or steel produced, but this might 

 be obviated by careful picking. 



"2. Brown lamellar substance, labelled Bronzite, from Amity, 

 N. J. Alone, it is infusible before the blowpipe ; with carbonate of 

 soda, a transparent white pearl; the same reaction with borax. 

 When reduced to an impalpable powder, it is attacked by acetic, ni- 

 tric, muriatic and sulphuric acids. 



" The analysis was made by means of muriatic acid and ammoni- 

 acal salts. 



"The silica having been separated by evaporation, the alumina, 

 iron, and a small portion of magnesia, were precipitated by ammonia, 

 added to an acid solution of the substance. The lime was obtained 

 by oxalate of ammonia, and the muriate of magnesia was evapora- 

 ted to dryness and decomposed by sulphuric acid. 



" The following are the results : 



Oxygen. 



Water, -,"""."- - 0.036 0.0319 1 



Silica, - - - 0.170 0.0882 



Alumina, - 0,376 0.1755 



8 



Ma 



0.243 0.0939 



Lime, - - - 0.107 0.0299 > 4 



Protoxide of iron, - 0.050 0.0113 



0.982 



By uniting the silica and alumina, and the bases magnesia, lime and 

 oxide of iron, we have the formula A{mg .Q .f.)(S .al)* -\- aq, which 

 represents a bi-silicio aluminate of isomorphous bases." 



Mr. Clemson expresses the opinion, that the so called Bronzite is 

 a new species ; and proposes for it the trivial nam*of Seybertite, 

 after the distinguished American analyst, Mr. Henry Seybert. 



* We have received a duplicate of thi* analysis, through Dr. R. Harlan of Phila- 

 delphia, in a letter from that gentleman from Mr. Clemson, dated Paris, Nov. 28, 1832. 



