_ eral, and this obliquity although an irregu- 
On a Native Phosphate of Iron, Manganese and Lithia. 101 
angle of the ptigm to that of Staurotide led to the supposition at 
first that the mmeral was a black variety of that species.* 
‘he accompanying figure exhibits the 
occurring planes. he form is normally a 
right prism; yet in very many of the erys- 
tals the terminal plane is oblique to the lat- 
larity, is not attended with any distortion 
of the adjoining plane ¢, the upper and 
lower edges of this plane being parallel 
notwithstanding the varying inclination of 
: e planes N and N’, are similar in 
lustre, yet according to the various meas- 
as 
assumed without the assistance of pressure from other crystals, 
the quartz being massive. The following are the results of the 
measurement of ten crystals with the common goniometer. 
Pha di Tae Vv. [vo vr vn vi) eS 
; Palet solo. 6 Lo eres 
N:N = |19s)131-198 |197-13031 0g ° [196 134 128° 1130 ° [130 © | 
N:b2 esa haw 13 |—|108 108 a 
N's b2 = |—H214- |—- 120 120-121 118-119 120 12 
P: ag ery 1G h 9 | me asl 
Nit = |—|101}-1 || —| — eee 
Nest = | 1198 110s 10-112 |—|=+ 
Nor N’?):b2  |159/162 Sd Galan = 
: : 94-97 90 93. fa 
{Pon edge NN’ } 8687 | 86 86, 180 | 82-83. i 
| I 
Several smaller crystals afforded for the last angle 90°, leaving 
little doubt that this is the true angle notwithstanding the dis- 
crepancies. The angle of the prism, (N:N’) averages 130°. 
Owing to the singular variations of angle exhibited, it is eVi- 
dent that many more crystals must be examined, before their — 
character is fully understood. The angle of the-prism approaches 
that given for triphyline, 132°; but this angle for triphyline was 
obtained from cleavage planes, and no such cleavages have been 
distinctly made out in this species. Its peculiarities suggest that 
the mineral is a new one; but so many species have already been 
Made from altered triphylines that we forbear naming it until 
: farther investigations have been made. 
* See this Journal, [2], x, 121; and also measurements by Mr. Hartwell who ob- 
with Mr. E. Hitchcock, Jr, the first specimens, same volume, page 265. 
