NATURAL HISTORY. 
169 
GALLERY.] 
idrialine-cinnabar, a mixture of cinnabar with the bitu¬ 
minous substance called idrialine, and earthy particles, 
from Idria, in Carniola, compact and slaty : the same with 
testaceous organic remains (coral ore). 
Case 10. Sulphuret of silver common silver glance, or 
henkelite, 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, or sternbergite ;—the scarce 
donacargyrite, or scliilfertz of German mineralogists.— 
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 anti¬ 
mony with baroselenite, realgar, &c., plumose antimony 
(feather-ore), some varieties of which, appearing like deli¬ 
cate wool or down, display a fine iridescent blue, yellow, 
and red tarnish.—With these is placed the hartmannite, a 
sulphuret of antimony and nickel *. 
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 silver-blende or 
ruby-silver , 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 formerthe miargyrite of H. Rose, first 
separated by Mohs from red silver under the name of 
hemiprismatic ruby-blende; to these is related the melan - 
glance, as likewise some varieties of the sulphur-salt com¬ 
monly called brittle silver-glance (the roschgewachs of the 
Hungarian miners) which appears to be composed of the 
same constituent elements as the dark and the bright red 
* Several of the plumose varieties of grey antimony are referable to 
the sulphur-salts in the next glass case. 
I 
