62 
natural history. (Minerals.) 
[north 
especially from Transylvania; radiated grey antimony with baroselenite, 
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*'. — With these is placed the hartmannite , a 
doubtful species, said to be a sulphuret of antimony and nickel. 
Case 11. This and part of the next Case contain the simple and 
double sulphur-salts formed by the sulphurets of antimony or arsenic, 
with basic sulphurets of electro-positive metals ; among these may be 
specified (besides some varieties of the plumose antimony or feather- 
ore)^ — ihejamesonite or axotomous antimony glance ; the geocronite of 
Swanberg; — the boulangerite, — the zinkenite, nearly related to plumose 
antimony ; — the silver-blende or ruby-silver , 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 former; — the miargyrite of H. Rose, first separated by Mohs 
from red silver under the name of hemiprismatic ruby-blende ; — to these 
is related the melan-glance, as are some varieties of the sulphur-salt 
commonly called brittle silver-glance (the roschgewachs of the Hunga- 
rian miners), which appears to be composed of the same constituent 
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, chiefly 
from Hungary and the Hartz the scarce polybasite. There are 
some other substances belonging to this order, such as, in 
Case 12, the f aid-ore or grey copper (a double sulphur-salt, on the 
chemical constitution of which much light has lately been thrown by 
the researches of H. Rose), crystallized, massive, and disseminated in 
various substances ; the more remarkable specimens are those from Hun- 
gary. The remaining space in this Case is occupied by the following 
sulphurets - sulphuret of arsenic , viz. the yellow orpiment , massive and 
in striated, separable laminse ; and the red orpiment or realgar, 
perfectly massive and crystallized, but decomposing by the action of 
light into an orange-coloured powder ;— several of the arsenio- 
sulphurets, such as the arsenic-pyrites or mispickel (some varieties of 
which, containing accidentally admixed silver, constitute Werner’s 
weiss-ertz ) ; — the cobalt-glance, massive and crystallized in the form of 
the cube audits modifications, &c., chiefly from Tunabergin Sweden; — 
the sulphuret of molybdenum or molybdena-glance, sometimes con- 
founded with scaly varieties of graphite. 
In the six following Cases the Oxides of the electro-positive metals 
are deposited. 
Case 13 contains the oxides and hydrous oxides of manganese , 
formerly distinguished as foliated, compact, and earthy grey manganese ; 
but now, from chemical and crystallographical distinctive characters, 
divided into the species called manganite, pyrolusite, psilomelane , 
hausmannite , braunite, &c., to several of which, but particularly the 
first two, may be referred the earthy manganese or wad , (a name also 
frequently given to earthy cobalt,) some varieties of which have the 
property of inflaming spontaneously when mixed with linseed oil. 
Case 14. In this and the two following Table Cases are deposited 
* Several of the plumose varieties of grey antimony are referable to the sulphur- 
salts in the next table case. 
