saloon, particles of quartz and brown iron-stone— Murio - 
Nat. hist, carbonate of lead , or horn-lead, the crystallized 
varieties of which have hitherto been observed in 
Derbyshire only. [An interesting suite of crys¬ 
tals of this scarce mineral substance will be 
found in the British Collection : Derbyshire.] 
—Sulphate of lead , called native lead-vitriol by 
Werner, crystallized and massive.— Lead earth , 
indurated and friable, of various colours \ its dif¬ 
ferent varieties appear to be related to carbo¬ 
nates, phosphates, and sulphates of lead: to which 
latter also the reniform lead ore (blei-niere 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 
produced by the decay of galena. 
Case 44. Ores of zinc. Among the many va¬ 
rieties of sulphur et of zinc, or blende, may be par¬ 
ticularized those relative to colour, viz . the yel¬ 
low, 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 Stromeyer ; the 
variety called testaceous blende (schaalen-blen- 
de), the most characteristic specimens of which 
are from Geroldseck in the Brisgau, contains, 
besides iron, a portion of lead,—The other ores 
of 
