116 
LONG 
GALLERY. 
Nat. Hist. 
species;—flexible silver glance.— Sulphuret of anti¬ 
mony , or 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. plumose antimony (feather- 
ore), some varieties 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 are 
referable to the sulphur-salts in the next glass case. 
Case 11. Part of this Case is occupied by the speci¬ 
mens 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, contain the simple and double sulphur-salts formed 
by the sulphurets of antimony and of arsenic, with 
basic sulphurets of electro-positive metals; they are 
(besides some varieties of the plumose antimony or 
feather-ore)— the jamesonite or axotomous glance anti¬ 
mony ;—the zinkenite, nearly related to plumose anti¬ 
mony ;—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 sulphuret of antimony of the for¬ 
mer;—the miargyrite of H. Rose, first separated by 
Mohs from red silver under the name of hemiprismatic 
ruby-blende;—the sulphur-salt commonly called brittle 
vitreous silver (the roschgewachs of the Hungarian 
miners) # appears to be composed of the same con¬ 
stituent elements as the dark and the bright red ruby- 
silver ores, but in different proportions \~bournonite, a 
sulphur-salt known also by the names of endellion, and 
triple sulphuret of lead, antimony, and copper;—the 
scarce polybasite ;—and in the next case, 
Case 12, the grey copper or fahl-ore (a double 
sulphur-salt, on the chemical constitution of which some 
* It is placed in the next glass case, No. 12. 
light 
