NATURAL HISTORY. 
161 
GALLERY.] 
both from Strickerum, Sweden;—to which are added speci¬ 
mens of sulphur, from the island of Volcano, incrusted and 
coloured by reddish-brown or orange-red particles of sele¬ 
nium. 
Case 5. The suite of specimens of sulphur (crystallized, 
massive, and stalactic, with selenite, sulphate of strontia, 
&c.; and the same found sublimed near the craters of vol¬ 
canos, &c.) is succeeded by the Sulphurets , which occupy 
half of this and seven of the succeeding glass-cases. They 
begin with sulphuret of manganese or manganese-blende, 
from Nagyag in Transylvania and from Peru.—Among 
the numerous varieties of sulphuret of zinc, or zinc-blende, 
may be particularized 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 others con¬ 
tain a portion of iron; the fibrous blende of Przbram in 
Bohemia, in which cadmium was discovered by Stromeyer; 
the variety called testaceous or schaalen-blende (the most 
characteristic specimens of which are from Geroldseck in 
theBrisgau) contains, besides iron, a portion of lead. 
Case 6. — Sulphurets of iron, or iron-pyrites:—common 
pyrites, smooth and striated, variously crystallized, from se¬ 
veral localities ; radiated pyrites, a substance very subject to 
decomposition, and to which belong most of the varieties 
of what is commonly called lenticular or coxcomb-pyrites, 
as also the globular pyrites, of a radiated texture, and the 
hepatic ox liver-pyrites of Werner, (distinct from the fer 
sulfure hepatique of some French mineralogists, which is 
both radiated and common iron-pyrites converted into 
brown iron-stone) ;— magnetic pyrites, which is nearly 
allied to the preceding species: massive and crystallized 
in six-sided prisms.— Sulphuret of cobalt, from Bastnaes 
in Sweden. — Sulphuret of nickel, formerly called capillary 
iron-pyrites, and afterwards considered as native nickel, 
till its real composition was determined by Arfvedson. 
Case 7- Sulphuret of copper, or vitreous copper, va¬ 
riously crystallized, foliated, compact, &c.; to which are also 
commonly referred the vegetable fossil remains known by 
the name of Frankenberg corn-ears, from the bituminous 
marl-slate of Frankenberg in Hessia, which are principally 
composed of vitreous and grey copper. — Tennanlite .— 
Sulphuret of copper and iron, to which belongs the yellow 
