Washingtonite, a new Mineral. 365 
shining, P the least brilliant. The crystals, fig. 1, from Westerly, 
R. L., often yield to cleavage parallel to P with much perfection, 
affording faces more brilliant than any of the natural planes of 
the crystals. Crystals from Litchfield sometimes manifest a ten- 
dency to cleave parallel with a. No cleavage in the direction of 
o unless through the intervention of quartz. Fracture rather un- 
even. Lustre imperfectly metallic. Color iron-black: the frac- 
ture iron-gray. Streak the same, but lighter. Hardness=5.75. 
Gravity =4.963 from Westerly, 5.016 from Litchfield. 
Before the blowpipe, 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 opake, 
orange-yellow glass, which on cooling, passes to an opake pearl- 
white. Its powder is decomposed (without evolution of chlo- 
rine) by long boiling in hydrochloric acid ; an abundance of ti- 
tanic acid separates from the solution, and the clear fluid after 
neutralization by ammonia and precipitation by succinate of am- 
monia, yields with carbonate of potassa a slight precipitate of 
carbonate of manganese. It may therefore be regarded as some 
titan — protoxide of iron, with a small proportion of oxide of 
mangane 
It is voting conceded that the mineral here described is not 
erystallographically shown to be distinct, in any essential manner, 
from the Axotomous iron-ore of Mons, or from the Crichtonite 
(including Ilmenite): indeed it appears most probable that all 
these minerals are not only identical in their angles, but are iso- 
morphous with Specular iron. If they are specifically distinct, 
indications of such differences may be looked for in the modifi- 
eations 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 clea- 
vage are obvious from the description above given ; those in lus- 
tre, color and streak cannot fail of striking any one, who compares 
the different substances with each other. The specific gravities 
m4 be judged of, from the following comparative table : 
Axotomous Iron-ore of Mous. 
From Gastein, Salzburg, G=4.661, Mons. 
= 4.723 4.730, Brerrnavret. 
