13S 
grey antimony, compact, foliated, radiated, and 
plumose : the more remarkable among these are 
the specimens of crystallized antimony in 
splendid groups, especially from Transylvania ; 
radiated grey antimony with barytes, realgar, 
&c., and the plumose, (or feather-ore,) some va¬ 
rieties of which, appearing like delicate wool or 
down, display a fine iridescent blue, yellow, and 
red tarnish : it should, however, be observed 
here, that several of the plumose varieties of 
grey antimony (together with the jamesonite 
and zinkenite deposited in this case), are refer¬ 
able to the sulpho-saits in the next glass case. 
Case 10. Part of this case is occupied by the 
specimens of sulphuret of arsenic, viz. the yellow 
orpiment , massive and in separable, striated, 
transparent laminae; and the red orpiment or 
realgar , perfectly crystallized and massive. 
The rest of this and part of the next case, con¬ 
tain the simple and double sulpho-saits formed 
by the sulphurets of antimony and of arsenic, 
with basic sulphurets of electro-positive metals; 
they are (besides the jamesonite, zinkenite, 
and some varieties of the plumose antimony or 
feather-ore in case 9)—the red or ruby silver ore , 
divided into the dark and the light red, both of the 
same crystalline forms, but in the latter of which 
sulphuret of arsenic takes the place of the sul¬ 
phuret of antimony of the former -the miargy - 
rite of H. Rose, first separated by Mohs from 
red 
LONG 
GALLERY. 
