152 Hoffmann — New mineral occurrences in Canada. 



only one of any appreciable dimensions in some twenty pounds 

 of the rock, which measures fifteen millimeters across. It is a 

 contact twin of two tetrahedrons, and on some of the faces is 

 triangularly marked by successions of crystal growth. On 

 some of the more minute crystals the rhombic dodecahedral 

 plane — which is striated in the direction of the longer diagonal, 

 is largely developed, sometimes obscuring the tetrahedral plane. 

 It has a faint yellowish orange-gray (faint yellowish-brown) 

 color; is translucent ; has a resinous luster; affords a yellow- 

 ish white streak ;is brittle, and breaks with a subconchoidal 

 fracture. The hardness is 6, and the specific gravity, at 

 15*5° O.j 3*25. Before the blowpipe, it fuses at about 5 to a 

 black enamel. With soda on charcoal, it gives a slight coat- 

 ing of zinc oxide. It is perfectly decomposed by hydrochloric 

 acid, with evolution of hydrogen sulphide and separation of 

 gelatinous silica. 



5. Spodumene. 



This species has been identified by Mr. P. A. A. Johnston 

 as being a prominent constituent of a micaless orthoclastic, 

 granitic vein-stone found, by Mr. A. P. Low, in 1899 cutting 

 syenite, on Walrus Island, one of a group of islands lying off 

 Paint Hill, east coast of James Bay, ITngava district, Northeast 

 Territory. 



The mineral occurs in more or less well-individualized gra}^- 

 ish green subtranslucent prisms, some of which measure more 

 than ten centimeters in length and from eight to ten milli- 

 meters in diameter. It has one well-developed prismatic 

 cleavage, the luster of which is pearly, while that of the cross- 

 fracture, which is an uneven one, is vitreous. The hardness is 

 nearly 7. Before the blowpipe, it swells up and fuses at about 

 4 to a white glass, imparting at the same time a bright purplish 

 red color to the flame. The finely powdered mineral is not 

 acted on by hydrochloric acid. 



6. Uranojpliane. 

 A mineral which, on examination by Mr. P. A. A. John- 

 ston, proved to be, as anticipated by the writer, uranophane, 

 has been found, associated with gummite, uraninite, black 

 tourmaline, white, light gray, pale olive-green and bluish green 

 apatite, spessartite, monazite, and green and purple fluorite, in 

 a coarse pegmatite vein — composed of white and light to dark 

 smoky-brown quartz, microcline, albite and muscovite, which 

 traverses a gray garnetiferous gneiss on the thirty-first lot of 

 the first range of the township of Villeneuve, Ottawa County, 

 in the province of Quebec. 



