gallery.] natural history. (Minerals.) 63 
massive and disseminated; galena of corroded appearance, decomposed 
and regenerated ; the compact and specular variety, called slickenside 
by the Derbyshire miners, &c.— steinmannite , probably a distinct anti- 
monial sulphur salt, is placed here, because several compact varieties of 
sulphuret of lead appear to be a mixture of it and common galena. 
Case 9. Sulphuret of bismuth , or bismuth-glance (bismulhine of 
Beudant), in acicular crystals, from Riddarhyttan, &c .—Sulphuret of 
copper and bismuth , called copper-bismuth, from Wittichen, in the 
Black Forest.—The needle-ore of Werner, a triple sulphuret of bis¬ 
muth, 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: it is called bell metal ore on ac¬ 
count of its colour, which is frequently that of bronze. The remainder 
of this case is taken up by a considerable suite of specimens of sul¬ 
phuret 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, or brand-erz , 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 laminae, being 
the korallenerz (coral ore) of Werner. 
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, 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, which, however, is considered as a 
combination of several sulph-antimoniurets of silver and lead.— Sul¬ 
phuret of antimony ( antimonitc, Haid.),also called grey antimony, com¬ 
pact, foliated, radiated, and capillary : 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 (plumosite of Haidinger), some varieties 
of which, appearing like delicate wool or down, display a fine irides¬ 
cent blue, yellow, and red tarnish: the chemical composition of some 
of them is uncertain. 
Case 11. 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 )—thejamesonite or axotomous antimony glance;—the geocronite of 
Swanberg ;—the kobelite ;—the boulangerite and embrithite ;—the zinck- 
enite, nearly related to plumose antimony ;—the silver-blende , red 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 or stephanite (the roschgewachs of the Hungarian miners). 
