NATURAL HISTORY. 
51 
GALLERY.] 
specified (besides some varieties of the plumose antimony or feather- 
ore) —\\ie jamesonite or axotomous antimony glance; the geocronite of 
Swanberg;—the houlangerite, —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 roschgewlichs 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;— hournonite, 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 falil-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- 
The remaining substances in this Case are (besides the sulphuret of 
molybdenum or molybdena-glance, sometimes confounded with scaly 
varieties of graphite) several of the arsenio-sulphurets, such as the 
arsenic-pyrites or mispickel (some varieties of which, containing acci¬ 
dentally admixed silver, constitute Werner’s weiss-ertz); —the cobalt- 
glance, massive and crystallized in the form of the cube and its modifica¬ 
tions &c., chiefly from Tunaberg in Sweden. 
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 
the oxides of iron :—the specular oxide or iron-glance, among the 
specimens of which may be specified those from Elba, remarkable on 
account of their beautiful iridescence and play of colours; the variety 
in large laminar crystals appearing like polished steel, from Stromboli 
and Vesuvius;—the micaceous iron-ore of Weimer, belonging partly 
to this species, partly to hydrous oxide of iron ;—also the red iron-ore, 
generally divided into compact red iron-stone and red hematite, are 
I varieties only of this species of argillaceous iron ores. 
' Case 15. Magnetic iron-ore, (Magnetstein of Werner,) a com¬ 
pound of protoxide and peroxide of iron, most of the varieties of which 
are strongly attracted by the magnet, while some of them possess po¬ 
larity, of which several specimens are placed in this Table Case :—crys¬ 
tallized, compact, and granular varieties, in serpentine, chlorite-slate, 
i D 2 
