Brush and Dana—Fairfield County Minerals. 47 
first paper; in other words, it contains from three to four per 
cent of iron protoxide. The lithiophilite, associated with the 
green chloritic mineral, has a light clove-brown color. It has 
a brilliant luster and is clear and transparent. The specific 
gravity is 8482. An analysis* by Mr. S. L. Penfield, afforded 
the following results :— 
Th. Mean. Atomic relation, 
P,03 45°22 45°22 45:22 P << "6 
FeO 13°10 12°92 13°01 Fe 180 ae 
MnO 31-93 32-12 32-02 Mn Mt Peg sod. 
Li,O ce 9-26 aicibe 
Na ,0 0°28 0:30 0°29 Na “010 aay 
H,O ‘tT ik oue OL? 
Gangue 0-31 0°28 0°29 
100°26 
The ratio, P: R:R=-686: 631: ‘628, corresponds very closely 
with the formula previously accepted, 
RRPO, or RPO, + BsP20.. 
It will be observed that the amount of iron in this variety of 
the mineral is considerably greater than in that first described 
and alluded to above, This result is not surprising, and indeed 
was anticipated from the color of the specimen. Mr. Penfield, 
in the article referred to, has brought together the analyses o: 
several varieties of triphylite and the two of lithiophilite, and 
thus shows the gradations between the two species. The one 
extreme is the Bodenmais triphylite with 36-21 p. c. FeO, and 
8:96 p. c. MnO, and the other the original lithiophilite, ‘with 
4:02 p.c. FeO, and 4086 p.c. MnO. The relation betw 
these two minerals, is closely analogous to that existing etic 
the iron and manganese carbonates, siderite (FeCO,), and ho 
dochrosite (MnCQ;), There is the same similarity in physic 
characters, the most pronounced difference being here as there 
in the color, so that the necessity of giving the two minerals of 
the triphylite group distinct names cannot be questioned. 
EOsSPHORITE. 
The eosphorite we have spoken of as meas nodules im- 
bedded in the massive green chloritic mineral. It occurs only ° 
massive, but shows the characteristic cleavage distinctly and is 
clear and sorted phe color is a beautiful pink, sometimes 
quite deep. ge: Enite Sette: is 3 ae = analysis by Mr. 
Horace L. Walle, ave ies the ollowing resul 
* This analysis has already been blished by Mr, Penfield in an article on the _ 
composition of x triphylite this Tinceak March, 1879. 
