46 
NATURAL HISTORY. (Minerals.) 
[north 
finest crystals have hitherto been found; to which are also commonly 
referred the vegetable fossil remains ( Cupressites Ullmanni, 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 
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, &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 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 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 capillary: the more remarkable among 
