On Columbite and other North American Minerals. 98 



for examination a mineral, which he discovered in the vicinity 

 of Philadelphia, which I have ascertained to be a Phosphate of 

 Manganese. It occurs in small imperfectly laminated masses* 

 imbedded in granite, near the New Water Works. It is of a 

 brownish black colour, with a chatoyant lustre. Its streak 

 is rather light brown. It is soft enough to be cut with a knife. 

 Alone before the blow-pipe, it is easily fusible, with ebullition, 

 into a black glass. With borax it forms a violet glass. 



Sulphuret of Antimony. My friend Mr. Oliver Bronson, an 

 active mineralogist of this Society, has put it in my power to 

 add this and the following mineral to the already extensive 

 catalogue found at Mr. Lane's mine, Huntington, Connecti- 

 cut. It is found incrusting and partly filling up cavities in 

 quartz, and is associated with sulphuret of iron. It is of a 

 lead-gray colour, easily scraped by a knife, and is almost en- 

 tirely volatilized before the blow-pipe, exhaling the odour qf 

 sulphur, but without any arsenical smell. 



Carbonate of Iron. This, like the preceding mineral, oc- 

 curs in cavernous quartz, in small drusy crystals, of a yellow- 

 ish-brown colour, and is associated with the sulphuret and mi- 

 caceous oxyd of iron. It dissolves very slowly, with efferves- 

 cence, in muriatic acid. Before the blow-pipe it becomes 

 black and magnetic, and when urged by the most intense heat 

 throws out brilliant scintillations. 



