1879.] 285 [ Wadsworth. 
On account of the small amount of material at my disposal, none 
of the specific gravity determinations could be depended upon. 
Lustre of the exterior of the crystals, vitreous; of the interior of 
the erystals and the massive parts, resinous, varying from feebly to 
strongly resinous. 
Color: crystals, hyacinth red; the massive parts, and the inte- 
rior of the crystals shading out to a very light brown. 
Streak white to a light brown, resembling that of cassiterite and 
of Some varieties of sphalerite. In a powder the color is a dirty 
white. 
Translucent. Fracture, sub-conchoidal, uneven. Brittle. 
In a closed tube, in a powder, it takes a darker color, and deposits 
a slight whitish sublimate. 
Open tube, unchanged. 
On charcoal fuses with intumescence to a black enamel after long 
heating, and becomes magnetic. Gives a coating of zincic oxide and 
plumbic oxide, the last but slightly; on addition of sodic carbonate 
the coatings become more marked, and if not too much soda is added 
it fuses to a feebly magnetic globule. If cyanide of potassium is 
added a coating (faint) of antimonious oxide is deposited, and the 
whole mass, after long heating, is absorbed by the coal. 
It is slowly dissolved in borax, giving a faint reaction for man- 
ganese in the oxydizing flame. On adding potassic nitrate to the 
bead the amethystine tint of the manganese becomes strongly marked. 
In the reducing flame the bead becomes colorless or gives a faint 
iron reaction. 
Slowly dissolves in salt of phosphorus, giving faint iron and man- 
ganese reactions in the oxydizing flame. The bead becomes cloudy 
in the reducing flame. 
Dissolves in sodic carbonate with effervescence, and if potassic 
nitrate is added gives a strong manganese reaction. 
Completely dissolves after some time in boiling concentrated hy- 
drochloric acid, with evolution of hydrogen sulphide, and separation 
of gelatinous silica in flocks. 
Dissolves in strong nitric acid after boiling some time, with sepa- 
ration of the silica, both in flocks and as a powder. 
Fuses at 3.5 to 4 to a black enamel. | 
The mineral is associated with magnetite and quartz, together with 
galenite, pyrite, sphalerite, and pyroxene, or a mineral apparently 
