234 



ACCOUNT OF THE MINERALOGY 



eighty ; in front it is nearly closed up with debris, which slope 

 gradually into it, so that it is in many places quite low. Herei 

 both in the solid rock, and among the fallen fragments, we 

 found specimens of zeolite in abundance, of the species Stil- 

 bite, Apophyllite, and Chabasie. 



The first of these was the most abundant, and occurred very 

 beautifully crystallized, in irregular crevices, disposed in 

 groupes, on globular mesotype, mixed with minute crystals of 

 chabasie, and of the following forms: 



1. Flat rectangular prism ; the broad surfaces of which have 



a lamellated and pearly aspect, while the narrow ones 

 are longitudinally streaked, with smooth shining termi- 

 nations, set at right angles to the rest, forming a paral- 

 lelopiped. 



2. The same ; having each of the solid angles replaced by 



two planes, set obliquely on the narrow sides of the- 

 prism, presenting the form dodecaidrc, fig. 178. of 

 Hauy. 



3. When the replacement of the solid angles is not complete, 



part of the terminal plane of the first variety remains. 

 Form epointe, fig. 179» of Hauy. 



Besides these, we found it in radiated and lamellar masses, 

 and in aggregations assuming the sheaf shape. 



The Apophyllite is a rarer mineral ; we found it only among 

 some of the fallen masses of rock, disposed on a ground si- 

 milar to, the last, and mixed witk crystals of stilbite. The 

 tbrms it assumes are very simple, and as follows : 



1. Equilateral rectangular prisms ; terminated at each end 

 by a plane set at right angles. Here the sides of the 



,1 to uau i-iou viiwi prism 



