PHYSIOGRAPHY. 



Sea polite. 



173 



SCAPOLITE. Pyramidal Pe t alin e-Sp a r. 

 Primary form. Right square prism. 

 Secondary forms. 



Fig. 388. Fig. 389. Fig. 390. 



Governeur, St. Law- 

 rence co., (N. Y.) 



Vesuvius.. 



Fig. 388. d on a =122 20'. M on d =135. M on 

 a =112 30'. Fig. 390. a on b =151 31'. M on b = 

 140 18'. a on a =136 22'. M on e =153 24'. don 

 e^!6l 35'. 



Cleavage, parallel with M and d distinct, but interrup- 

 ted ; traces of P, generally a small conchoidal fracture in 

 this last direction. Fracture imperfectly conchoidal, une- 

 ven. Surface of the prisms longitudinally streaked, but 

 generally of nearly the same physical quality. 



Lustre vitreous, inclining to resinous upon the cleavage 

 and fracture, parallel with the bases; inclining to pearly up- 

 on M and d. Color various shades of white, grey, blue, 

 green and red. Streak greyish white. Transparent . . . 

 translucent on the edges. 



Brittle. Hardness = 5-0 ... 5-5. Sp. gr< = 2-612, 

 Meionite; = 2-726, white crystallized Scapolite from 

 Finland. 



