NATURAL HISTORY. 
167 
GALLERY.] 
precious substance occurs in the East Indies and in Brazil. 
._Specimens of anthracite or kohlenblende (to which may¬ 
be referred the Kilkenny coal), with native silver from 
Kongsberg, &c.;— graphite (commonly called black-lead), 
massive, disseminated in porcelain earth, &c.— Seleniu- 
rets : lead seleniuret;—copper and lead seleniuret;—mer¬ 
cury and lead seleniuret, all from Tilkerode, Hartz; —cobalt 
and* lead seleniuret;—copper seleniuret;—copper and sil¬ 
ver seleniuret (eukairite), both from Strickerum, Sweden;— 
to which are added specimens of sulphur, from the island 
of Volcano, incrusted and coloured by reddish-brown or 
orange-red particles of selenium. 
Case 5. The suite of specimens of sulphur (among which 
may be specified the splendid crystallizations from La Ca- 
tolica in Sicily, and from Coniila in Spain, the stalactic, 
and other varieties, accommpanied by selenite, sulphate of 
strontia, &c.; and the massive and pulverulent sulphur 
found sublimed near the craters of volcanos, &c.) is suc¬ 
ceeded 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 Nag- 
yag in Transylvania and from Peru.—Among the nu¬ 
merous 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 first discovered ; the va¬ 
riety called testaceous or schaalen-blende (the most cha¬ 
racteristic specimens of which are from Geroldseck in the 
Brisgau) containing, besides iron, a portion of lead. 
Case 6.— Sulphurets of iron , or iron-pyrites : — common 
pyrites , crystallized and variously modified, in cubes smooth 
and striated, from several localities;— radiated pyrites , a 
substance very subject to decomposition , andto 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, (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 
