50 
NATURAL HISTORY. 
[NORTH 
(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 
globular bodies composed of concentric testaceous laminee, being the 
korallenerz (coral ore) of Werner. 
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, which is often seen coating 
other ores of silver, appears to be a pulverulent variety of this species; 
—flexible silver glance, or sternbergite ;—the scarce donacargyrite, or 
schilfertz of German mineralogists.— Sulphuret of antimony, or grey 
antimony, compact, foliated, radiated, and plumose : the more remark¬ 
able 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 hart- 
mannite, 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 laminse; 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 or arsenic, with basic sulphurets of electro¬ 
positive metals ; among these may be specified (besides some varieties 
of the plumose antimony or feather-ore)—the jamesonite or axotomous 
antimony glance;—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 commoply 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 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 scare e 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 arsenic-sulphurets, 
such as the arsenic-pyrites or mispickel (some varieties of which, con¬ 
taining accidentally admixed silver, constitute Werner’s weiss-ertz) ; 
cobalt-glance, massive and crystallized in the form of the cube and its 
modifications, &c. 
- Several of the plumose varieties of grey antimony are referable to the sulphur- 
salts in the next glass case. 
