176 S. L. Penfield—Analyses of Lithiophilite. 
Art. XX1.—Analyses of two varieties of Lithtophilite (Manga- 
nese Triphilite); by S. L. PENFIELD. 
Tue author has already published* analyses of both triphyl- 
ite and lithiophilite from the various known localities, and he 
regards it of interest to add to these two additional analyses, one 
of lithiophilite from Tubbs Farms, Norway, Me., a new American 
locality, the other of a variety from Branchville, Conn. The 
specimens from Norway, Me., are associated with quartz, albite 
and tourmaline, and are broken fragments of considerable size, 
blackened on the exterior by oxidation, to which the mineral 
is peculiarly liable, but in the interior perfectly fresh and of a 
light salmon color. Specific gravity, 3°398. 
Two varieties of lithiophilite from Branchville have already 
been described from independent but closely contiguous de- 
sits. The first of a light salmon-pink color, containing from 
three to four per cent of iron protoxide, the second of a light 
clove-brown color, containing thirteen per cent of iron pro- 
toxide. A third variety, from an independent deposit, is of 
a very pale bluish tint, of a brilliant luster, clear and trans- 
parent. Specific gravity, 3°504. 
The analyses of these varieties gave the following results: 
Norway, Me. Branchville, Conn. 
FeO 8°60 16°36 
MnO 35°98 28°58 
CaO “18 “05 
Li,O 8°50 8°59 
Na,O 14 
. 20 119 54 
Gangue “12 18 
99°71 99°39. 
These analyses fully substantiate the formula of an orthophos- 
phate, Li(Mn, Fe)PO,, already made out for the species, giving 
the following ratios: 
: Mn with Fe and Ca : Li with Na 
‘Norway 1 1:02 ¢ 0°91 
Branchville 1 1:00 : 0°91 
If part or all of the water be taken as basic the ratios are still 
r. 
ing the close relation and gradual transition between the two 
Sheffield Scientific School, June 22, 1883. 
_* This Journal, II, xiii, 426; IIL, xvii, 226. 
