162 NATURAL HISTORY. [NORTH 
copper or copper-pyrites, including the pale-yellow fine¬ 
grained variety, called hematitiform or blistered copper- 
pyrites; and the variegated copper ore (buntkupfererz), 
differing from the former in the proportions of its con¬ 
stituent 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 
bismuth, lead, and copper.— Sulphuret of copper and tin, 
or tin-pyrites —The remainder of this case is taken up by 
a considerable suite of specimens of sulphuret of mercury 
or cinnabar, divided by Werner into the dark-red (by far 
the most common variety), and the bright-red cinnabar 
(native vermilion, much esteemed by painters); the hepatic 
or idrialine-cinnabar, a mixture of cinnabar with bitu¬ 
minous and earthy particles, from Idria, compact and slaty : 
the same with testaceous organic remains (coral ore). 
Case 10. Sulphuret of silver, vitreous silver, or silver 
glance, massive, crystallized, and in other external forms, 
among which are the laminar and capillary: the black 
silver ore appears to be a pulverulent variety of this spe¬ 
cies ;—flexible silver glance.— Sulphuret of antimony, or 
grey antimony, compact, foliated, radiated, and plumose: 
the more remarkable among these are the specimens of 
crystallized antimony in splendid groups, especially from 
Transylvania; radiated grey antimony with baroselenite, 
realgar, &c., plumose antimony (feather-ore), some varie¬ 
ties of which, appearing like delicate wool or down, dis¬ 
play a fine iridescent blue, yellow, and red tarnish: it 
should, however, be observed here, that several of the plu¬ 
mose varieties of grey antimony are referable to the sulphur- 
salts in the next glass case. 
