22 Geology, Sz-c. of the Connecticut' 



Hampton,) primitive greenstone, greenstone slate, mica 

 slate and gneiss, so that without mentioning the rare mine- 

 rals found in the vicinity, it is evident that an interesting 

 assemblage of rocks is presented in the neighbourhood for 

 the instruction of the geological student. 



Fac Simile of Goshen Graphic Granite. [See Plate 1, Fig. 1.] 



A description of this granite has been already given in the 

 First Part of this Sketch. But having since discovered 

 some more perfect specimens, I thought it might not be un- 

 acceptable to have one of them copied. It is not common 

 to find specimens so well marked as the one from which the 

 plate was taken ; yet, in general, they are quite handsome. 

 The points, triangles, &,c. of quartz, usually enlarge, or di- 

 minish, as they traverse the feldspar. Thus, the specimen, 

 of which the plate is a copy, exhibited on its opposite side 

 (about four inches distant from the surface that was copied,) 

 the same characters but four times as large. 



Pseudomorphous Granite. [See Plate 1, Fig. 2.] 



It is not an easy matter to give a good graphic represen- 

 tation of this rock. Perhaps however, the one annexed may 

 assist in understanding the description given on p- 17, vol. vi. 

 The dark part represents the plates of mica ; — the red part 

 the quartz, and the uncoloured portion, the feldspar. This 

 rock occurs abundantly in Goshen, connected with the 

 graphic granite above described ; and the transition of the 

 one into the other is usually very sudden. 



Lusus Naturae. [See Plate 1 , Fig. 3.] 



For a description of this, see page 15, vol. vi- 



Desiderata in the Geology and Mineralogy of the Connec- 

 ticut. 



It may be remarked in general, that but a small part of 

 the geolog) and mineralogy of this region has been brought 

 to that degree of perfection to which these sciences have 

 feeen carried in some countries in Europe ; and, therefore, 



