46 
natural history. (Minerals.) 
[north 
finest crystals have hitherto been found; to which are also commonly 
referred the vegetable fossil remains (Cupressites UUmanni , Room I. 
Wall Case 6) known by the name of Frankenberg corn-ears, from the 
bituminous marl-slate of Frankenberg in Hessia, which are principally 
composed of vitreous and grey copper:—the sulphurets called kupfer- 
indigo , and the digenite of Breithaupt, are by some considered as 
varieties only of copper glance. — The silver-copper glance of Stro- 
meyer, called stromeyerite by Beudant. 
Sulphuret of copper and iron , to which belongs the chalcopyrite? 
copper pyrites or yellow copper, including the pale-yellow fine-grained 
variety called hematitiform, or blistered copper-pyrites; and the varie¬ 
gated copper ore (buntkupfererz and bornite ), differing from the former 
in the proportions of its constituent parts, and easily known by the 
reddish colour of its fractural surfaces: crystallized, massive and foliated* 
— Tennantite, by some referred 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 
©rouped 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, &c.— steinmannite , probably a distinct an- 
timonial 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 aeicular 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 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 {antimonitc, Haid.),also called grey antimony, com¬ 
pact, foliated, radiated, and capillary: the more remarkable among 
