45 
Mr. Smithson, and varieties of the same from 
Siberia; all of them probably produced by the 
decay of galena. 
Case 44. Ores of zinc. Among the many 
varieties of sulphuret of zinc, or blende, may be 
particularized those relative to colour, viz, the 
yellow, the brown, and the black blende of 
Werner; the first of which is generally most 
pure, while the two others contain a portion of 
iron ; the fibrous blende of Przbram in Bohemia, 
in which the cadmium was discovered by Stro- 
meyer; the variety called testaceous blende 
(schaalen-blende), the most characteristic spe¬ 
cimens of which are from Geroldseck in the 
Brisgau, contains, besides iron, a portion of lead. 
—The other ores of zinc in this case are those 
of a sparry appearance, commonly called cala-^ 
mine, which constitute three different species, 
viz, the electric or siliceous calamine, in a variety 
of which the presence of cadmium has been an¬ 
nounced by the late Dr. Clarke; the common 
calamine, or native carbonate of zinc; and the 
red oxide of zinc : the specimens of the two for¬ 
mer species include various crystalline and other 
forms, among which are the pseudomorphous 
crystals of carbonate of zinc, derived from mo¬ 
difications of calcareous spar. 
Case 45. Ores of tin, of which we have the 
sulphuret of tin, or tin pyrites, and the oxides, 
which are divided into common tin-stone, and 
wood-tin :—tin pyrites, hitherto only found in 
Cornwall, 
SALOON. 
Nat. Hist. 
