162 
NATURAL HISTORY. 
[north 
of Werner, a triple sulphuret of bismuth, lead, and copper, only found 
near Ekatherineburg, in Siberia, accompanied by native gold, &c_- 
Sulphuret of copper and tin, or tin-pyrites , only found in Cornwall. — 
The remainder of this case is taken up by a considerable suite of 
specimens of sulphuret of mercury or cinnabar , chiefly from Almaden, 
in Spain, and from the Palatinate, 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 idrialine-cinnabar, a mixture 
of cinnabar with the bituminous 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 henhelite, 
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 species;—flexible silver glance, or Sternbergitej —the 
scarce donacargyrite, or schilfertz 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 antimony with baroselenite, realgar, &c., plumose antimony 
(feather ore), some varieties of which, appearing like delicate 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 specimens of sul¬ 
phuret of arsenic, viz. the yellow orpiment, massive 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 contain the simple and double sulphur-salts formed by the 
sulphurets of antimony and of arsenic, with basic sulphurets of electro¬ 
positive metals; they are (besides some varieties of the plumose 
antimony or feather-ore)—th ejamesonite 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 sulphuret of arsenic takes 
the place of the sulphuret of antimony of the former;—the 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 are 
some varieties of the sulphur-salt commonly called brittle silver-glance 
(the roschgewachs of the Hungarian miners), which appears to be com¬ 
posed of the same constituent elements as the dark and the bright red 
ruby-silver ores, but in different proportions;— bournonite, a sulphur- 
salt known also by the names of endellion, and triple sulphuret of lead, 
antimony, and copper;—the scarce polybasite ;—and in the next Case. 
Case 12, the fahl-ore or grey copper (a double sulphur-salt, on the 
chemical constitution of which much light has lately been thrown by 
the researches of H. Rose), crystallized, massive, and disseminated in 
various substances. 
The remaining substances in this Case are (besides the sulphuret of 
molybdenum or molybdena-glance') several of the arsenio-sulphurets, 
*■ Several of the plumose varieties of grey antimony are referable to the sulphur- 
salts in the next glass case. 
