GO natural history. (Minerals.) [north 
(Cupressites UUmanni , Room I. Wall Case 6) known by the name 
of Frankenberg corn-ears, from the bituminous marl-slate of Franken- 
berg in Hessia, which are principally composed of vitreous and grey- 
copper : the sulphuret called copper indigo appears to be only a variety 
of copper glance. 
Sulphuret of copper and iron , to which belongs the copper pyrites 
or yellow copper, including the pale-yellow fine-grained variety called 
hematitiform, or blistered copper-pyrites; and the variegated copper ore 
(buntkupfererz), differing from the former in the proportions of its con¬ 
stituent parts, and easily known by the reddish colour of its fractura! 
surfaces: crystallized, massive and foliated.— Tennantite, by some re¬ 
ferred to fahl ore, or grey-copper ore, from Cornwall. 
Case 8 contains a suite of specimens of sulphuret of lead or galena , 
which include a great variety of modifications of crystals, detached and 
grouped together, (the more remarkable modifications, besides those of 
Great Britain, from the Hartz and from Saxony,) in combination with 
blende, pyrites, and many other substances; galena of various grain, 
massive and disseminated; galena of corroded appearance, decomposed 
and regenerated ; the compact and specular variety, called slickenside 
by the Derbyshire miners, &e.— steinmanniie , 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 (bismuthine 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 laminse, 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, which, however, is considered as a 
combination of several sulph-antimoniurets of silver and lead.— Sul¬ 
phuret of antimony (antimonite Haid.),also called grey antimony, com¬ 
pact, 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. 
