LEAD. 



413 



Geological Situation. Tiiis mineral is found in various formations, as ihc primary, the 

 transition and the secondary. In this /State, it is found in veins in granitic rock, in the Tren- 

 ton and Lockport limestones, and in the coarse sandstones of the Sliawangunk mountains. 



Uses. Galena is the ore which is almost exclusively employed in the reduction of the 

 metal. 



LOCALITIES. 



In the preceding part of this work, I have given a full detail of all the information which 

 was in my possession at the time of its publication, with respect to the localities of this ore, 

 the condition of mining operations, etc. (see page 44). I shall here add only a few notices 

 of the crystalline forms which have been observed, and a few facts in regard to the present 

 situation of some of our lead mines. 



Lewis County. In the vicinity of Martinsburgh, several veins of galena have been found, 

 traversing the Trenton limestone. It is usually associated with iron pyrites and the six-sided 

 crystals of calcareous spar. The crystalline forms which have been observed here, are the 

 cube (Fig. 488); the regular octahedron. Fig. 489; the octahedron with one solid angle 

 replaced by a tangent plane. Fig. 490 ; and the same with all the solid angles replaced, as in 

 Figs. 491 and 492. The crystals arc usually small. 



Fig. 480. 



Fig. 490. 



Fij. 492. 



Fig. 493. 



Orange County. In the town of Deerpark, galena has re- 

 cently been found in small quantities. According to Dr. 

 Horton, it sometimes has the form of the cube (Fig. 488), and 

 that of the compound crystal represented in Fig. 493. 



St. Lawrence County. The Rossie mines have yielded 

 the finest crystals of galena which have heretofore been found 

 in this State. Some of these arc of very large size, and con- 

 sist of groups variously arranged. The)'- are associated with 

 calcareous spar, iron and copper pyrites, cclestinc, etc. The 

 most common forms are the cube (Fig. 488) ; and the cube 



