36 
saloon, case are the dark and light coloured varieties of 
Nat. Hist, red silver, massive, crystallized and n combination 
with various substances ;- — the black silver ore, or 
sooty silver, which has not been analysed ; — - 
the muriate of silver, called also corneous sil- 
ver and horn ore, of various colours, amorphous, 
botryoidal, in laminae, and crystallized in minute 
cubes and octohedrons ; — the very scarce carbo- 
nate of silver from Alt-Wolfach inSuabia — In this 
case begin the numerous copper ores, with native 
copper, which, like the native silver., presents 
a great variety of forms, besides the crystallized, 
such as dendritic, filiform, &c. 
{Case 28.) 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 bitumous marl- 
slate of Frankenberg in Hessia, and are princi- 
pally composed of vitreous and grey copper.— The 
variegated copper ore, easily known by the reddish 
colour of its fractural planes : among the varieties 
of this species is the foliated from Cornwall. — 
The grey copper ore (fahi-ore,) crystallized, mas- 
sive, and disseminated in various substances. 
(Case 29.) Ores of copper continued : copper 
pyrites, the most common of all the ores of this 
metal i 
