232 



PHYSIOGRAPHY. 



Gmelinite. 



GMELINITE. Sarcoline Ko uphone-Spar. 



Primary form. Rhomboid : dimensions unknown. 



Secondary form. Regular hexagonal prism, with the 

 terminal edges replaced by single planes. 



y on y' - - - 83 36' 



Cleavage parallel to the rhomboid, visible, though not 

 easily obtained. Fracture uneven. Surface streaked, the 

 prism horizontally, the pyramidal planes parallel to the edg- 

 es of combination with the rhomboid. 



Lustre vitreous. Color white, passing into flesh-red. 

 Streak white. Translucent. 



Hardness =4*5. Sp. gr. =2'05. 



1. Before the blow-pipe, it swells up, and assumes the appearance of 

 an enamel. When held in the flame of a candle, it exfoliates into nume- 

 rous scales. 



2. Analysis. 



By VATJQTJELUV, By THOMSON, 



3, It is found in the cavities of amygdaloidal rocks, at Montecchio- 

 Maggiore, and at Castel in the Vicentine, and in the county of Antrim 

 in Ireland. 



