100 
NATURAL HISTORY. 
[long 
hemiprismatic ruby-blende; —the sulphur-salt commonly 
called brittle vitreous silver (the roschgewachs of the Hun¬ 
garian 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 light 
has lately been thrown by the researches of H. Rose), 
crystallized, massive, and disseminated in various sub¬ 
stances. 
The remaining substances in this Case are (besides the 
sulphuret of molybdenum or molybdena-glance) several of 
the arsenio-sulphurets, such as the arsenical pyrites or 
mispickel (some varieties of which, containing accidentally 
admixed silver, constitute Werner's weiss-ertz); cobalt 
glance , massive and crystallized in the form of the cube 
and its modifications, &c. 
In the six following Cases the oxides of the electro-posi¬ 
tive metals are deposited. 
Case 13 contains the oxides and hydrous oxides of man¬ 
ganese, for the present only arranged according to their 
old division into foliated, compact, and earthy grey man¬ 
ganese ; a remarkable variety of the latter is the wad , 
which has the property of inflaming spontaneously when 
mixed with linseed oil.—Oxide of manganese, zinc and 
iron ( franklinite ) &c. 
Case 14. This and the two following Cases contain 
the oxides of iron . Specular oxide of iron or iron glance , 
among the specimens of which may be specified those 
from Elba, remarkable on account of their beautiful iri¬ 
descence and play of colours ; the variety in large laminar 
crystals appearing like polished steel, from Stromboli and 
Vesuvius ;—the micaceous iron ore of Werner, belonging 
partly to this species, partly to the scaly hydrous oxide 
red iron ore } divided into compact red iron stone and red 
hematite. 
Case 15. Oxydulated iron or magnetic iron-stone , 
massive and of various grain, compact, crystallized, in ser- 
* It is placed in the next glass case, No. 12. 
