PART OF NEW YORK. 191 



and chemical characters,) it may he considered as be- 

 ing only a variety. The south face of the hluff near 

 Roger's rock-, presents an entire mass, which is com- 

 posed principally of this mineral ; its height is ahout 

 fifty feet, and length eighty. 



Colour, light blackish-green, and black : lustre, 

 generally feeble, sometimes resinous : semi-transpa- 

 rent: fracture in mass,fine grained : scratches glass : 

 structure, granular : the grains, which are small ; in 

 some specimens, adhere firmly, in others, feebly. It 

 is accompanied by Sphene, Garnet, Carbonate of 

 Lime, and Feldspar, 



Sphene. 



This accompanies the Pyroxene and Coccolite. 

 Its colour is reddish and yellowish-brown : lustre 

 resplendent : nearly transparent : crystalline : form 

 dioctaedre of Hauy : that which occurs with the 

 coccolite has no regular form. 



Granular Garnet 



This accompanies the Coccolite ; and is also found 

 in large masses unmixed with any other mineral : It 

 has been called by some mineralogists, red Coc- 

 colite. 



Its colour is red, of various shades : grains small, 

 and feebly adhering. 



Massive Garnet. 



This is found in large masses : it passes into the 

 preceding variety. 



i 



