5 
ve 
en 
100 Ona Native Phosphate of Iron, Manganese and Lithia. 
The specific gravity of the crystal analyzed was 2:876, dried 
at 212 F. 
The manganese was found to be in the state of a peroxyd. 
The iron was also proved to be mostly if not wholly in the same 
state of oxydation, and asuaee from the condition of the man- 
ganese that it was whol 
ay rom the second morale we have as the oe cage ratio for the 
oxyds, peroxyds and phosphoric acid, 1-67 : 14°87 : 25-02, 
a closely to 1: 9: 15, corresponding to ae ah, 3P. Suip- 
posing the protoxyds absent we have the simple formula #*. 
But including the protoxyds which are beyond doubt essential to 
_ the species, we can propose no satisfactory formula. 
It is possible that the mineral may have undergone altera- 
tion by a peroxydation of some or all of the iron or manganese, 
as happens with other phosphates of these metals; but on this 
point we cannot be fully assured without farther exploration at 
the locality. On the supposition that all the metals were origin- 
ally protoxyds, and have undergone peroxydation, and. that the 
mineral has not lost any essential part of its bases by infiltra- 
ting waters, it would afford the oxygen ratio for protoxyds and 
phosphoric acid, 11:86 : 25: 02, or nearly 1:2, which would 
edge this formula R> £2, But in the present state of our knowl- 
give the formula is altogether hypothetical. In the first analysis, 
aie proportion of phosphoric acid was not separated from 
the iron 
Although the species appears to be near Triphyline, the results 
end to prove a wide difference from that species rather than an 
igen with it. 
Art. XIV.—On the Physical and Cry ystallographie characters — 
of the Phosphate of Iron, Manganese - Lithia, of Nor- 
wich, Massachusetts ; by ‘James D. Dan 
phosphate of iron, manganese and lithia of Norwich, 
THe 
analyzed by Mr. Craw, occurs in crystals imbedded in quartz 
along with the etlyataltized spodumene of that locality; a mas- 
sive variety has not been observed. ‘I'he crystals have an iron- 
ack color, and are wholly opaque; hardness 5-5-5; streak 
brownish-red. They are rather stout prisms, varying from a fourth 
of an‘inch or smaller to over an inch in diameter, and often they 
are regularly terminated at both extremities. ‘The faces are smooth 
with in general but little lustre, yet somewhat shining. Cleav- 
age imperfect ; basal sometimes distinct ; also traces parallel t to one 
lateral plane have been observed. ‘The close approximation in: nthe 
