GALLERY.] 
63 
natural history. (Minerals.) 
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 oftcm 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, which, however, is considered as a 
combination of several sulph-aritimoniurets of silver and lead. Sul- 
phuret of antimony (antimonite, Haid.),also called grey antimony, com- 
pact, foliated, radiated, and plumose: the more remarkable amono- 
these, are the specimens of crystallized antimony in splendid groupiT, 
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 
doubtful species., said to be a sulphuret of antimony and nickel. 
Case 11. This and part of the next Case contain the simple and 
double sulphur-salts formed by the sulphureis 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) — thejamesonite or axotomous antimony glance ; the geocronite of 
Swanberg; — the hob elite the boulangerite /—.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 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 endeliion, and triple sulphuret of lead, antimony, and copper, 
chiefly from Hungary and the Hartz the scarce polybasite. There 
are some other substances belonging to this order, such as, in 
Case 12, the fahl-ore or grey copper (a double sulphur-salt, on the 
chemical constitution of which much light has been thrown by 
the researches of H. Rose), crystallized, massive, and disseminated in 
various substances: the more remarkable specimens here deposited are 
those from Hungary. The remaining space in this Case is occupied 
by the following sulphurets : — sulphuret of arsenic, viz. the yellow orpi- 
ment, massive and in striated, separable laminae ; and the red orpiment 
or realgar, massive and perfectly crystallized, but decomposing by the 
action of light into an orange-coloured powder ; — several of the arsenio- 
sulphurets , such as the arsenic-pyrites or mispickel (some varieties of 
wdiich, containing accidentally admixed silver, constitute Werner’s 
weiss-ertz) the cobalt-glance, massive and crystallized in the form of 
the cube and its modifications, &c., chiefly from Tunabergin Sweden ; - 
the sulphuret of molybdenum or molybdena-glance (sometimes con- 
founded with scaly varieties of graphite), chiefly from Saxony. 
* s . ev fJ al of the plumose varieties of grey antimony are referable to the sulphur- 
salts in the next table case. F 
