OF ARKANSAS. 155 
The blende is very pure, though occasionally small particles of iron 
pyrites and copper pyrites are visible. Fragments of a large crystal, of 
brownish-yellow color, were found, on examination, to be pure sulphuret 
of zinc, with only 0.47 per cent. of sulphuret of cadmium, and a trace of 
copper. The qualitative examination of another specimen showed the 
presence of a small amount of cadmium, with traces of copper and iron. 
0) 
The subjoined table will furnish a comprehensive view of the composi- 
tion of the ores from the various localities; the numbers in the column 
“carbonic acid and water,” have mostly been obtained by subtracting from 
100 the sum of the directly determined constituents. Thinking it a mat- 
ter of some interest, to compare the ores of Arkansas with those of other 
countries, I have added a few analyses of the ores of Upper Silesia, where 
about one-half of all the manufactured zinc is produced, and some other 
localities, and it will be seen, on comparison, that the Arkansas ores are 
inferior to none, and superior even to the famous Silesian ores. 
1 to 9 correspond to Nos. 1 to 9 of the Report; 10, analysis of a 
white compact smithsonite from the “ Planet-Grube,” near Tarnowitz, 
Upper Silesia; 11, analysis of a compact smithsonite from the “ Marie 
Grube,” near Miechowitz, Upper Silesia; 12, analysis of a red compact 
smithsonite from same locality; 18, analysis of a white compact smith- 
sonite from the “ Scharley-Grube,” near Beuthen, Upper Silesia; 14, ana- 
lysis of ared compact smithsonite from Polonia; 15, analysis of a compact, 
brownish, smithsonite from the “ Busbacher Berg,” near Aachen, Prussia; 
16, 17, and 18, crystallized smithsonites from Altenberg, near Aachen; 19 
and 20, crystallized, green smithsonite from the ‘ Herrenberg,” near 
Aachen; 21, crystallized smithsonite from Moresnet, Belgium. 10 to 14 
have been analyzed by G. Von Gellhorn, [Chem. pharm. Centralblatt, 
1853]; 15 to 20 by Monheim, [Chem. pharm. Centralblatt, 1850, and Dana, 
system of mineralogy, 4th ed.]; 21, by Schmidt, [Rammelsberg, 5th supple- 
ment.] 
