47 
interesting suite of crystals of tliis scarce mineral 
substance will be found in the ]5ritisli Collection: 
Derbyshire .]—Sulphate of lead, called-native lead- 
vitriol by Werner, crystallised and massive .—Lead 
earth, indurated and friable, of various colours ; its 
different varieties appear to be related to carbo¬ 
nates, phosphates, and sulphates of lead : to which 
latter also the reniform lead ore (blei-niere of Wer¬ 
ner) from Siberia appears to belong: some varieties 
of lead earth are oxides. Near to these is also placed 
the native niinimn, from Hessia, first described by 
Mr. Smithson, and varieties of the same from Sibe¬ 
ria ; all of them probably produced by the decay of 
galena. 
(Case 44.) Ores of zinc. Among the many va¬ 
rieties oi sulphuret of zinc, or blende, may be par¬ 
ticularized 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 variety called 
testaceous blende (schaalen-blende), the most cha¬ 
racteristic specimens of which are from Geroklseck 
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 calamine, 
which constitute three different species, viz. the elec¬ 
tric or calamine; the calamine, or 
native carbonate of zinc ; and the red oxide of zinc: 
the specimens of the two former species include va- 
SALOON. 
Nat. Hist. 
nous 
