114 
LONG 
GALLERY. 
Nat. Hist. 
Kongsberg, &c.;— graphite (commonly called black- 
lead), massive, disseminated in porcelain earth, &c.— Se - 
leniurets, —only those of copper and silver (eukairite), 
those of lead and copper, and the selenium-sulphur, are at 
present in the collection. 
Case 5. The suite of specimens of sulphur (crys¬ 
tallized, massive, and stalactic, with selenite, sulphate of 
strontia, &c.; and the same found sublimed near the 
craters of volcanos, &c.) is succeeded by the Sul - 
phurets , which occupy half of this and seven of the 
succeeding glass-cases. They begin with sulphuret of 
manganese or manganese-blende, from Nagyag in Tran¬ 
sylvania 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 w T hich is gene¬ 
rally most pure, while the others contain 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 charac¬ 
teristic specimens of which are from Geroldseck in the 
Brisgau) contains, besides iron, a portion of lead. 
Case 6.— Sulphurets of iron, or iron-pyrites: — com¬ 
mon pyrites, smooth and striated, variously crystallized, 
from several 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 or liver pyrites of Werner, (dis¬ 
tinct from the fer sulfure hepatique of some French mi¬ 
neralogists, 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 con¬ 
sidered as native nickel, till its real composition was 
determined by Arfvedson. 
Case 7. Sulphuret of copper , or vitreous copper , 
variously 
