Miscellaneous Localities of Minerals. 249 



readily admit of cleavage parallel to the lateral planes of a 

 rhombic prism, of 125° and 55°. There is also a cleavage 

 apparently perpendicular to the axis of the prism ; but it is 

 attended with some difficulty, and the planes produced by 

 it are not very brilliant or perfect. Its colour is hair-brown, 

 of various shades. It possesses a shining, pearly, pseudo- 

 metallic lustre, is translucent, and scratches fluate of 

 lime, and glass ; the latter, however, with difficulty. Be- 

 fore the blow-pipe it is infusible. 



2. Pseudomorphoiis Quartz is found at the Southamp- 

 ton lead-mine, in crystals having the form of hexaedral 

 prisms, with triedral terminations. They probably received 

 this form from carb. lime, which has since decayed, and left 

 them hollow. They occupy cavities in quartz, and are 

 grouped together, lying in every direction. They are quite 

 small : none of them being more than half an inch in length, 

 or one quarter of an inch in diameter. Their colour is uni- 

 formly a brownish yellow — when viewed with a good micro- 

 scope, their outer su|face is perceived to be covered with 

 exceedingly minute six-sided pyramids. 



3. Carbonate of Lead is found at the SouthamptoH 

 lead-mine, crystallized in right rhombic prisms of 117" and 

 63° — its primary form. The following varieties of this mine- 

 ral occur at the same place. Green Carb. of Lead. The 

 colour is uniformly diffused through the mass, or crystal, and 

 is occasioned hy the infiltration of green carb. of copper. 

 Earthy Carb. of Lead. Its colour is reddish brown. It oc- 

 curs massivcj and disseminated. Its fracture is uneven, and 

 presents a somewhat resinous lustre. It is usually opaque. 

 In dilute nitric acid it effervesces. Before the blow-pipe, 

 it splits with decrepitation, and is immediately reduced to 

 the metallic state. 



Amherst, March 22, 1825. 



4. Bi/ Dr. E. Emmons. . 



Carb. Manganese, Cummington, (Mass.) 

 Colour red, varying from flesh colour to rose red. Exter- 

 nally gray, grayish black, and black. The purest specimens 

 possess the hardness of phosphate of lime. The recent frac- 

 ture soon changes to a dark colour, on being exposed to mois-^ 

 tare. 



Vol. IX. -No. 2. 32 



