3 7 
of minute crystals.—Common sulphuret of silver , 
or vitreous silver; massive, crystallyzed, and in 
other external forms, among which are the laminar 
and capillary.—Brittle vitreous silver, of which 
some specimens are also deposited in the following 
odass case. 
(Case 31.)—The ores of silver contained in this 
case are the dark and light-coloured varieties of 
red silver ore, massive, crystallized, and in combina¬ 
tion with various substances; the black silver ore 9 
or sooty silver, which has not been analysed;— 
the muriate of silver , called also corneous silver 
and horn ore, of various colours, amorphous, bo- 
tryoidal, in laminae, and crystallized in minute 
cubes and octohedrons;—the very scarce ca?'bo- 
nate of silver from Alt-Wolfach in Suabia.—In 
this case begin the numerous copper ores, with 
native copper, which, like the native silver, pre¬ 
sents a great variety of forms, besides the crystal¬ 
lized, such as dendritic, filiform, &c. 
(Case 3%.) Ores of copper continued ; com¬ 
mon sulphuret of copper or vitreous copper, va¬ 
riously crystallized, foliated, compact, &c. To 
this are also commonly referred the oblong, scaly, 
secondary fossils, known by the name of Franken - 
berg corn ears, which occur in the bituminou s 
marl-slate of Frankenberg in Hessia, and are 
principally composed of vitreous and grey copper. 
—The variegated copper ore, easily known by the 
reddish colour of its fractured planes : among the 
varieties 
SALOON. 
Nat. Hist. 
