45 
lead, or red lead ore, deposited in this case, are saloon. 
particularly beautiful and instructive ; the ac- natThist. 
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 reel 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 rare substance, the murio-carbonate 
of lead, or horn lead, analysed by Klaproth, 
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 reniforrn lead ore (blei- 
niere of Werner) from Siberia appears to belong: 
some varieties of lead earth are oxides. Near to 
these is a!so placed the native minium, from lies- 
si a. 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 
particularized 
