276 De Lury — Cdbaltite in Northern Ontario, Canada. 



ite from Nordmark* is given in II, while in column III the 

 percentage conposition corresponding to the formula, CoAsS, 

 is appended. 



Professor G. R. Mickle of the School of Practical Science, 

 University of Toronto, obtained some of the vein-matter from 

 Mr. Columbus' claim in October 1905, and presented it to 

 Professor T. L. Walker of the University of Toronto, who 

 kindly gave it to the writer for examination. 



Chemically, physically and crystallographically, this note 

 adds little to our knowledge of cobaltite. However, as this is 

 the first authentic discovery of the mineral in North America, 

 it is worthy of being recorded. Leonhard,f in 1843, describes 

 its occurrence in Connecticut in a conglomerate, but Dana does 

 not recognize this locality. 



Mineralogical Laboratory, University of Toronto, Jan., 1906. 



*Flink, Ak. H. Stockholm Bihang, xii (2), No. 2, 5, 1886. 

 fTop. Min., p. 321, 1843. 



