45 
lead, or red lead ore, deposited in this case, are 
particularly beautiful and instructive; the ac¬ 
companying substances are green lead ore, and 
sometimes small greenish brown crystals of a 
substance, the component parts of which are the 
oxides of lead and of chrome: the gangue stone 
in which the red lead occurs in the gold mines of 
Beresof is a kind of micaceous rock mixed with 
particles of quartz and brown iron stone.—In this 
case is also placed an interesting suite of crystals 
of that most yare substance, the murio-carbonate 
of lead, described by the Comte de Bournon, 
and which has hitherto been observed in Derby¬ 
shire only.—Sulphate of lead, called native lead- 
vitriol by Werner, crystallized, and massive.—• 
Lead earth, indurated and friable, of various co¬ 
lours ; its different varieties appear to be related 
to carbonates, 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 Hes- 
sia, first described by Mr. Smithson, and varieties 
of the same from Siberia; all of them probably 
produced by the decay of galena. 
(Case 40.) Ores of zinc.—Among the many 
varieties of sulphuret of zinc, or blende, may be 
M particularized 
saloon. 
Nat. Hist. 
