100 
NATURAL HISTORY. 
[long 
hemiprismatic ruby-blende;—the sulpbur-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 hour non ite, 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-sulphur els, 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. 
