Mr. T. S. Hunt's Examinations of some Canadian Minerals. 325 



and indications of another oblique to it, which is less apparent. 

 Hardness about 6-5. Specific gravity 2"732-2'733. Lustre 

 vitreous, approaching to pearly upon the cleavage faces ; trans- 

 lucent ; colour greenish-white. The analysis was performed 

 upon carefully selected grains, and the pulverized mineral first 

 dried at 212^ F. was afterwards exposed over the surface of sul- 

 phuric acid. It gave — i 

 08 Li 

 Silica . . . 00-.\ 47-40 47-30 

 Alumina . . ^ify. 30-45 daBJol 

 Lime . . . tJ^/V. 14-24 omiJ 

 Magnesia ... -87 '/I 

 Protoxide of iron . -80 '! 



Soda 2-83 'ingi-^dBiJf 



Potash . . .-7" -38 



, Water . ^ . . r ^^ 2-00 . ^ 1-80 



nan lonio gJi dJiv/ bsxuofnoD ^'-^ — — ^ »<ydi lo aJmao't an 1 



■ '^Jixuq sdT ,ais*i\vi an j$°i^^iiivjana BidJ wode ^8l^.tf)6•| 



; aoi)j"nir!n;>:-! ,tij'ir!p-i?'.frff /li fvjPii-r'iv gsvf b?rtrr;ido ,R')rJi3 



The water in this mineral seems to be chemically combined. 

 Thomson in his analysis gives the same amount of silica and 

 water as abo\e, but for the rest differs greatly as to the propor- 

 tions of lime and alkali. Its composition distinguishes it at 

 once from pyroxene, while fi'om scapolite it difi'ers iu its greater 

 hai'dness and its cleavage ; from these latter characteristics, as 

 well as from its chexnioaj -Qomposition, itjmu^1(Ij.thiijj|Lbe| regarded 

 as anorthite. . li ; -i i, ,,' 



The mineral from the vicinity of Perth, which has been 

 generally circulated among mineralogists under the name of 

 Bytownite, is finely granulai', almost compact, and has a smoky- 

 blue colour, with a hardness of about 6, and a specific gravity of 

 2-739. When viewed under a magnifier, it is seen to be a mix- 

 ture of a light-coloured translucent granular mineral, apparently 

 like the preceding, exhibiting cleavages with a vitreous lustre, 

 and intermixed with minute grains of what appears to be black 

 hornblende. The present specimens exhibit such a mixture that 

 its analysis would be valueless. 



Labradori/e. — This s])ecies is common in boulders in the vi- 

 cinity of the crystalline rocks of the province, from Labrador to 

 Canada West, but has not yet been found in place. In Drum- 

 mond C W., large masses of the mineral ai-e met with, some 

 portions of which exhibit a play of colours equal to that of La- 

 brador. The fragment from this locality, submitted to analysis, 

 had a specific gravity of 2"097. Colour lavender-blue with a 

 pearl-gray opalescence; it gave — 



