GALLERY.] 
NATURAL HISTORY. 
101 
characteristic specimens of which are from Geroldseck in 
the Brisgau) 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 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 
in six-sided prisms.— Sulphuret of cohalt, 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, which occur in the 
bituminous marl-slate of Frankenberg in Hessia, and are 
principally composed of vitreous and grey copper. — Ten - 
nantite .— Sulphuret of copper and iron, to which belongs 
the yellow copper or copper pyrites, including the pale- 
yellow fine-grained variety, called hematitiform or blistered 
copper pyrites; and the variegated copper ore (buntkupfer- 
erz), 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. 
Case 8 contains a suite of specimens of sulphuret of lead 
or galena, which include various modifications of crystals, 
detached and grouped together, in combination with 
blende, pyrites, and many other substances; galena of 
various grain, massive and disseminated; galena of cor¬ 
roded appearance, decomposed and regenerated; the com¬ 
pact and specular variety, called slickenside by the Derby¬ 
shire miners. 
Case 9. Sulphurets continued: sulphuret of bismuth, 
or bismuth glance, in acicular crystals, from Riddarhyttan, 
&c.—■ Sulphuret of copper and bismuth, called copper-bis¬ 
muth .—The needle-ore of Werner, a triple sulphuret of 
