Hoffmann — New mineral occurrences in Canada. 153 



The mineral which, in this instance, is evidently an altera- 

 tion-product of gummite, occurs in small bright lemon-yellow 

 fibrous masses, sometimes in immediate contact with the gum- 

 mite found coating the uraninite or, per se, embedded in the 

 albite immediately surrounding the tourmaline and often 

 invading the latter. In the closed tube it blackens and gives 

 off water. Before the blowpipe, it affords, with salt of phos- 

 phorus, in the oxidizing flame, a yellowish green bead, which, 

 on reheating in the reducing flame, assumes a fine green color. 

 Warm hydrochloric acid decomposes it, with separation of 

 flocculent silica. 



