Notice of the locality of Sulphate ofBarytes, ^c. 43 



es. In other ridges I have not found any sand-stone below 

 the green-stone, which there seems sunk, as if in a trench, 

 below the general level. I hav^e designed this article as a 

 brief notice of ihe locality of the Sulphate of Barytes ; I 

 shall therefore dismiss more general observations. The 

 sulphate is found in a vein, perhaps two or three feet wide, 

 in a ridge of green-stone. I have subjoined a rude outline 

 of jhe vicinity. The ridge of green-stone in which this vein 

 is situated, sinks on its eastern side below the general levels 

 «nd is fronted by a wall of sand-stone at the distance of three 

 or four rods. It contains three interesting localities. (A) 

 the Barytes vein; (C) the coal-mine, and (D) the leadmine 

 (A) the vein of Barytes. This is in the bed of a brook, 

 where it passes in a deep ravine through the green-stone 

 ridge, directly below a mill-dam. The ravine is divided by 

 two masses of rock, so that there are three dams. The 

 north turns a grist-mill; the middle an oil-mill; and 

 the south a saw-mill. At the bottom of the ravine the 

 three channels unite, and pass under two bridges almost 

 contiguous. The vein appears first in the bed of the south 

 channel, just below the saw-mill ; it is there traceable north 

 by east about a rod. It is again discoverable about font 

 rods north, in the bed of the stream belovir the upper 



bridge. Both of these points are on the same line. The 



vein is two or three feet wide; its surface is iron brown, and 

 tarnished; but on breaking it, it appears of an opake pear- 

 ly white. It is foliated, and breaks into rhomboidal frag- 

 ments; it is very brittle, which renders it very difficult to 

 detach it in large masses; it often assumes on its surface 

 the appearance of coxcomb spar. I have found fragments 

 of it in the brook below, imbedding crystals of Galena* 

 Parallel with it, and separated by a narrow partition of 

 green-stone, is a thin vein of carbonate of Ifzne foliated, and 

 transparent in fragments, 

 carbonate easily distinguishes it from the pearly hue of the 

 sulphate. The eastern wall of the ravine projects over, and 

 forms a recess near the upper point of the vein ; the ceihng 

 of this recess is covered with minute effervescing stalactites. 

 Directly south of the vein the green-stone rock has beefr 

 torn away, and its fragments are full of geodes of quartz 

 crystals, often taking the form of hollow cylinders Jined 

 with crystals. A 



of 



