I 



No. 4.] HARRINGTON — CANADIAN MINERALS. 247 



The fracture varies from uneven to conchoidal. The colour is 

 mostly black, but in some specimens blackish-green. On the 

 edgcc or in thin splinters the mineral is translucent, and by trans- 

 mitted lioht appears deep bottle-green. The lustre is vitreous, 

 and sometimes almost splendent. The hardness is about six, and 

 a crystal, of which the following is an analysis, was found to 

 have a specific gravity of 3'385 : 



Silica 51-275 



Alumina 2-821 



Ferric oxide 1-317 



Ferrous oxide 9-164 



Mae:anous oxide 0-329 



Lime 23-334 



Magnesia 11-612 



Loss on ignition 0-174 



100-026 



The analysis shows that this is an aluminous lime- magnesia-iron 

 pyroxene, and its composition and other characters seem to con- 

 nect it with the variety sometimes called fassaite. 



Examples of other varieties of pyroxene may be met with at 

 almost any of the apatite mines. They vary much in colour, 

 usually baing of some shade of green or grey, but sometimes 

 white or brown. Lower down the Ottawa, in the augmentation 

 of Grenville, a beautiful lilac pyroxene occurs, the crystals of 

 which are sometimes imbedded in a pale lemon-yellow scapolite. 



Now and then crystals of large dimensions are obtained. One, 

 for example, from the township of Templeton is eleven and a 

 half inches in circumference, nine inches long, and weighs eight 

 and one-third pounds. Large crystals have also been found on 

 the sixth lot of the first range of Portland township, and a por- 

 tion of one now in the museum of the Geological Survey weighs 

 about twelve pounds. Some of them, though dull outwardly 

 are glas.sy within, and of a pale bottle-green colour. 



The simplest forms observed are cryst:ils of sahlite showing 

 the following combination : ooPcc. go P. [ccPoo]. Pa: . P. 

 Other planes are, however, frequently present, and among them 

 2 P. 3 P.-P. and oP. Sometimes the crystals of sahlite are 

 striated longitudinally, and they are often much flattened in the 

 direction of the orthodiagonal. One, for example, having a 

 width of an inch and eight-tenths, measured only seven-tenths of 

 an inch in thickness ; another, an inch and a half wide, was 



