gallery.] 
NATURAL HISTORY. 
99 
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 
mercurial ore or liver ore, 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 barytes, real¬ 
gar, &c., plumose antimony (feather-ore), some varieties of 
which, appearing like delicate wool or down, display a fine 
iridescent blue, yellow, and red tarnish : it should, how¬ 
ever, be observed here, that several of the plumose varieties 
of grey antimony are referable to the sulphur-salts in the 
next glass case. 
Case 11. Part of this Case is occupied by the speci¬ 
mens of sulphuret of arsenic, viz. the yellow orpiment, mas¬ 
sive and in striated, transparent, separable laminae; and 
the red orpiment or realgar, perfectly crystallized and 
massive.—The rest of this and part of the next Case con¬ 
tain the simple and double sulphur-salts formed by the 
sulphurets of antimony and of arsenic, with basic sul- 
phurets of electro-positive metals ; they are (besides some 
varieties of the plumose antimony or feather-ore)—the 
jamesonite or axotomous glance antimony; —the zinkenite, 
nearly related to plumose antimony;—the red or ruby 
silver ore, divided into the dark and the light red, both of 
the same crystalline forms, but in the latter of which sul¬ 
phuret of arsenic takes the place of the sulphuret of anti¬ 
mony of the former;—the miargyrite of H. Rose, first 
separated by Mohs from red silver under the name of 
hemiprismatic ruby-blendethe sulphur-salt commonly 
called brittle vitreous silver (the roschgewachs of the Hun- 
