102 
NATURAL HISTORY. 
[long 
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 petrifactions (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 glanc e.—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-blende;—the sulphur-salt commonly 
called brittle vitreous silver (the roschgewachs of the Hun- 
