62 natural history. (Minerals.) [north 
portion of iron; the radiated, fibrous and testaceous blende, the most 
characteristic specimens of which are from Przbram in Bohemia, and 
from Geroldseck in the Brisgau. 
Case 6.— Sulphurets of iron, or iron pyrites: — one of the most widely 
diffused metallic ores, and belonging to all geological formations; it is 
divided into common pyrites , or marcasite , crystallized in cubes smooth 
and striated, variously modified, as octahedral and pentagono-dodecahe- 
dral forms, or these forms combined: from several localities, among 
which Traversella, in Piedmont, the isle of Elba, St. Gothard, Aren- 
dahl, Cornwall, yield the finest specimens;— radiated pyrites, a sub¬ 
stance very subject to decomposition, and to which belong most of the 
varieties of what is commonly called lenticular or coxcomb-pyrites, 
spear-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, from Boden- 
mais, Bavaria, &c. ; massive and crystallized in six-sided prisms;—the 
kausimkies or lonchidite of Breithaupt, also called sparkles. — Sulphuret 
of cohalt, linneite , from Bastnaes in Sweden.— Sulphuret of nickel or 
nickel-blende (millerite, Haid.), formerly called capillary iron-pyrites j 
(haarkies W.), and afterwards considered as native nickel, till its real 
composition was determined by Arfvedson, from Joachimsthal and Mer¬ 
thyr Tydvil;—the gersdorffite, a sulph-arseniuret of nickel— Sulphuret 
of cadmium , from Bishoptown in Renfrewshire to which the name of 
greenockite has been given, after Lord Greenock, its discoverer: one 
of the crystals here deposited well exhibits the peculiar adamantine 
lustre of this substance. 
Case 7. Sulphuret of copper, copper glance, or vitreous copper , 
compact, foliated, and variously crystallized, &c., chiefly from Redruth, 
Cornwall, and from Bristol in Connecticut, in which two localities the 
finest crystals have hitherto been found; to which are also commonly 
referred the vegetable fossil remains ( Cupressites Ullmanni, Room I. 
Wall Case 6) 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:—the sulphurets called kupfer- 
indigo, and the digenite of Breithaupt, are by some considered as 
varieties only of copper glance.—The silver-copper glance of Stro- 
meyer, called stromeyerite by Beudant. 
Sulphuret of copper and iron, to which belongs the chalcopyrite, | 
copper pyrites or yellow copper, including the pale-yellow fine-grained 
variety called hematitiform, or blistered copper-pyrites; and the varie¬ 
gated copper ore (huntkupfererz and bornite), differing from the former 
in the proportions of its constituent parts, and easily known by the 
reddish colour of its fractural surfaces: crystallized, massive and foliated. I 
— Tennantite, by some referred to fahl ore, or grey-copper ore, from 
Cornwall. 
Case 8 contains a suite of specimens of sulphuret of lead or galena , 
which include a great variety of modifications of crystals, detached and 
grouped together, (the more remarkable modifications, besides those of 
Great Britain, from the Hartz and from Saxony,) in combination with 
blende, pyrites, and many other substances; galena of various grain, I 
