1818.] VICINITY OF PHILADELPHIA. 47I 



-dal garnet. Werner says, melanite occurs in the newest 

 fixtz trap formation. 



Garnet, Grenat, H. 



Some beautiful specimens of the variety of garnet 

 called pyrope, occur at Mr. Wilcox's paper mill, about 

 one mile from Concord, Chester county. Colour, a fine 

 dark red, and when polished makes a fine stone of 

 luxury. 



Common Garnet, 



Very large quantities of this variety, occur in the 

 primitive formation of our vicinity, more particularly so 

 in the mica slate on the Schuylkill. 



The best specimens, of the dodecaedron with rhom- 

 boidal faces, are found on the Wichicon creek, about 

 nine miles from the city. The prismatic garnet 'is also 

 found near the same place. 



The dodecaedron, truncated on all its edges, occurs 

 on the eastern side of the same creek, on the top of a 

 hill, about half a mile above its confluence with the 

 Schuylkill. A very fine large specimen, now in posses- 

 sion of Mr. S. Morton, measuring about five inches in , 

 diameter, was found in digging a well at Barrenhill 

 meeting house, twelve miles from the city. 



The trapezoidal garnet, with twenty-four faces, oc- 

 curs remarkably perfect, of a very deep red colour, in 

 the mica shist, about one and a half miles above the falls 

 of Schuylkill, where the lock is now forming. Some of 

 those taken to Paris by Mr. Vanuxem, are highly prized 

 by Haiiy, as beautifully illustrating the theory of decre- 

 ments. 



