[graham] 



ALBITE 



195 



and also a fair prismatic cleavage, parallel to the predominant prism 

 a(1120). The free ends of the crystals are colourless and transparent, 

 but the more massive material appears white, or is filled with inclu- 

 sions of dark green chlorite. 



The specific gravity, as determined in methylene iodide, is 2 • 944. 

 The refractive indices, using the minimum deviation method and 

 sodium light, were measured as 



e=l-673, w = l-656, e-w=+0-017, 

 but the images obtained being somewhat faint, these values are only 

 approximate. 



Especial interest attaches to the phenacite from the fact that 

 this is the first record of the occurrence of the mineral in Canada. 



Figure 4. 



New Forms on a Crystal of Albite from the Ascot Mine, 

 Sherbrooke County, Quebec 



A crystal of albite occurring on a specimen collected by Dr. 

 Ferrier at the Ascot Mine, Sherbrooke County, Quebec, exhibits 

 several forms which appear to be new for this mineral. The crystal, 

 shown in Plate II, figure 4, has the usual prismatic albite habit, and is 

 composed of two individuals twinned according to the albite law. The 

 most prominent of the new forms occurs in the prism zone, where there 



