46 
saloon, of lead, or horn lead, analysed by Klaproth, and 
Nat. Hist, ; which has hitherto been observed in Derbyshire 
only .—Sulphate of lead, called native lead-vitriol 
by Werner, crystallized and massive .—Lead 
earth , indurated and friable, of various colours ; 
its different varieties appear to be related to car¬ 
bonates, phosphates, and sulphates of lead ; to 
which latter also the reniform lead ore (bleiniere 
of Werner) from Siberia appears to belong: some 
varieties of lead earth are oxides. Near to these 
is also placed the native minium, from Hessia, 
first described by Mr. Smithson, and varieties of 
the same from Siberia ; all of them probably pro¬ 
duced 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 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 
constitute three different species, viz. the electric 
or siliceous calamine ; the common calamine, or 
native carbonate of zinc \ and the red oxide of 
zinc: the specimens of the two former species 
include 
