d8 ON SOME NEW FORMS, &C. 



The inclination of the different faces are 

 I upon s 135° 

 x e 142° 55' 



x P 150° 5' 



This variety which is one-fourth of an inch in 

 length, is in the possession of Mr. John P. Wetherill, 

 who found it in the place above-mentioned. The 

 prism is composed of eight hexagonal faces termi- 

 nated by pyramids of eight faces, the summits being 

 replaced by four rhomboidal ones corresponding 

 with the faces of the primitive octahedron. 



D ihE* 2 E*P 



Zircon fhisunitakej 1 



I u s x P pi. V. fig 6. 



The inclination of these faces are 

 I upon u 159° 17' 

 u P152° 8' 



x 1 142° 55' 



x P 150° 5' 



I s 135° 



This variety was found by Mr. Benjamin Say. 

 The' faces u are sometimes so much extended as to 

 make the faces of the pyramid almost entirely dis- 

 appear. 



The gangue, in which these crystals are found, is 

 a granite composed of partly decomposed feldspar, 

 sometimes of a greenish color, and quartz, contain- 

 ing besides the zircon particles of magnetic iron ore. 



