46 
SALOON. 
Nat. Hist. 
particularized those relative to colour, vi%. the 
yellow, the brown, and the black blende of Wer¬ 
ner ; the first of which is generally most pure, 
while the two others contain a portion of iron; 
the variety called testaceous blende (Schaalen 
blende), the most characteristic specimens of 
which are from Geroldseck in the Brisgau, con¬ 
tains, besides iron, a portion of lead.—The other 
ores of zinc in this case are those of a sparry 
appearance, commonly called calamine, which 
Mr. Smithson has ascertained to constitute three 
different species, viz. the electric or quartzy cala¬ 
mine, which becomes strongly electric by heat; 
the common calamine, or native carbonate of 
zinc; and the hydrous carbonate of zinc: the 
specimens of the two former species include 
various crystalline and other forms, among 
which are the pseudomorphous crystals of car¬ 
bonate of zinc, derived from modifications of 
calcareous spar. 
{Case 41.) 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, nearly pure, mixed with copper pyrites, 
&c;—among the specimens of common tin stone 
may be particularized the regular and macled 
crystals. 
