87 
and octahedrons variously aggregated, in reticu- SA LOO N - 
lar plates, kc. —The ores of mercury in this case Nat. Hist. 
are :—the sulpliurets , consisting of dark-red cin¬ 
nabar (by far the more common variety), massive, 
crystallized, and in combination with various 
mineral substances ; the bright-red cinnabar (na¬ 
tive vermilion, much esteemed by painters) ; the 
hepatic mercurial ore from Idria, compact and 
slaty ; the former also with petrifactions (coral 
ore) ; muriate of mercury , or corneous mercury, 
with native quicksilver, &c. 
(Case 30.) This case contains (besides some 
additional specimens of gold and mercurial ores, 
among the latter of which is the scarce native 
amalgam , crystallized and globular,) the ores of 
silver , between which and the ores of gold are 
placed the alloy called eleclrum , from Smeof in 
Siberia, and the auriferous silver from Kongs- 
berg in Norway, both being a mixture of gold 
and silver in different proportions. Other alloys 
of silver are the scarce antimonial silver from 
Wolfach and Andreasberg, and the arsenical 
silver from Guadalcanal in Andalusia.—Among 
the numerous varieties of native silver may be 
particularized the various imitative forms in which 
it occurs, such as tooth-shaped, wire-shaped, den- 
dritical, moss-like, reticular, &c., many of which 
are aggregations of minute crystals.—Common 
sulphur et of silver, or vitreous silver \ massive, cry¬ 
stallized, and in other external forms, among which 
are 
