MISCELLANEA. 
135 
Westerley, often yield to cleavage parallel to P, with mucli per- 
fection, affording faces more brilliant than any of the natural 
planes of the crystals. Crystals from Litchfield sometimes ma- 
nifest a tendency to cleave parallel with a. No cleavage in the 
direction of o, unless through the intervention of quartz. Frac- 
ture rather uneven. Lustre imperfectly metallic. Color iron 
black; the fracture iron-gray. Streak the same, but lighter. 
Hardness equal to 5*75. Gravity = 4*963 from Westerley_, 5*016 
from Litchfield. 
Before the blow-pipe, infusible; but changes to a grayish 
black color. Unmagnetic before and after ignition ; with borax 
it fuses with effervescence into a clear, green glass, with a shade 
of yellow. With salt of phosphorus it dissolves, forming an 
opaque orange yellow glass, which on cooling passes to an 
opaque pearl white. Its powder is decomposed (without evolu- 
tion of chlorine) by long boiling in hydro-chloric acid ; an abun- 
dance of titanic acid separates from the solution, and the clear 
fluid after neutralization by ammonia and precipitation by suc- 
cinate of ammonia, yields with carbonate of potassa, a slight 
precipitate of carbonate of manganese. It may, therefore, be 
regarded as some titaniate of protoxide of iron, with a small pro- 
portion of oxide of manganese. 
It is readily conceded that the mineral here described is not 
crystallographically shewn to be distmct from the Axotomous iron 
ore of Moh's, or from the Chrichtonite (including Ilmenite) ; 
indeed it appears most probable that all these minerals are not 
only identical in their angles, but are isomorphous with specular 
iron. If they are specifically distinct, indications of such dif- 
ferences may be looked for in the modifications of their primary 
forms, in cleavages and in lustre; while essential differences 
will doubtless be found in specific gravity and hardness. The 
disagreements in secondary forms and cleavage are obvious from 
the description above given ; then in lustre, color and streak 
cannot fail of striking any one who compares the different sub- 
