117 



TAB. CLXI. 



SILEX analcimus primitivus. 



Cubical Analcime. 



Class 2. Earth. Order l. Homogeneous. 

 Gen. 4. Silex. Spec. Analcime. 



Div. 1. Crystallized. 



Although the Cubic Analcime of Haiiy, or what is still 

 by some called Cubic Zeolite, is not rare in some parts of 

 Ireland, especially among basaltic rocks, yet we have had 

 very little account of it. The present specimens were 

 sent me by favour of my friend Mr. Templeton, F. L. S., 

 of Belfast, and were gathered at Cave Hill, near that 

 place. Haiiy distinguishes this fossil as having fractures 

 on the six faces*, or in three directions only j but these 

 specimens are not always easily procured. It is, however, 

 sufficiently distinct from Fluor by its superior hardness, 

 easy fusion into a transparent white glass without ebulli- 

 tion, and want of phosphorescence ; having indeed all the 

 characters of tab. 59, except as to form. I have met 

 with impressions of this with other Analcime, as well as 

 small crystals imbedded in the radiated Analcime, or what 

 is by some called radiated Zeolite, in the holes of Basaltic 

 Trap, if I may so call it, for it certainly is not Lava, with 

 which this sort of Trap has been confounded. I hope soon 



* Those of the cube. 

 VOL. II. L 



