RE-EXAMINATION OF AMERICAN MINERALS. 161 



59. ZlNC-BLENDE. 



Blende is found in considerable quantity, both massive and 



crystallized. Some of the crystals are exceedingly beautiful 



and of large size, being three or four inches in diameter, and 



with very brilliant surfaces. The colors are dark hair-brown 



and black, the brown being transparent. The specimens from 



this locality are hardly surpassed by those from any other 



mine. A specimen that was analyzed gave the following 



results : 



Sulphur .' 33.82 



Zinc 64.39 



Cadmium 98 



Copper 32 



Lead 78 



100.29 

 It is proposed to examine yet other specimens, to see if there 

 may not be larger amounts of cadmium contained in some of 

 them. 



This mineral occurs in fluor-spar, calc-spar, and quartz, more 

 or less mixed with the other sulphurets. In some instances it 

 is very peculiarly interlaced in the rocks ; thus we have speci- 

 mens consisting as it were of four layers; namely, granite, 

 then compact crystallized quartz three fourths of an inch 

 thick, then the blende an inch thick, on that a layer of crystals 

 of calc-spar, and on this last fluor-spar. 



60. Calamine. 



Calamine is found in delicate crystals of a silky luster, 

 forming in some instances snow-white tufts on fluor-spar, 

 blende, and carbonate of lime. It is also found on cellular 

 quartz. Some of the specimens are quite handsome, having a 

 blue and yellow color from the presence of carbonate of copper 

 and oxide of iron. No analysis was made of any of the speci- 

 mens. 



61. Brown Hematite. 



This ore occurs in concretionary masses of a dark liver- color 

 and compact structure, associated with nearly all the minerals 

 of this mine; it very commonly forms a lining to cavities in 

 galena, in which are found crystals of anglesite and cerusite ; 



