48 Brush and Dana—Fairfield County Minerals. 
Ratio. 
P,0,; 31°39 P.O; “231 1:06 
#10; 21°34 AIO; "208 Le 
FeO 6°62 FeO 323 
MnO 22°92 MnO 092 212 
CaO 48 CaO 026 
9 15°28 H,O0 849 4°04 
100-49 
The ratio of P,O;: AlO;: RO: H,O is very nearly 1:1:2:40 
that given in our at eee paper, and upon which the formula — 
was based, viz : 
ike.08 4H.,0 or A1P,0, + 2H.(Mn,Fe)O, + 2aq. 
THE GREEN MINERAL. 
The larger part of this deposit consisted, as already stated, 
of a soft green compact ogee Rout te in tint from li 
grayish and yellowis the i 
ull to greasy. Hardness = b. “Specifie gravity of the sre 4 
portions = 2°85 to 2°89. This material was exceedingly im-— 
pure, Sete bee imbedded in it, the felds = and mica of the 
vein, also quartz, apatite, chabazite, as well as the phosphates, © 
most conspiouously among these, the eosphorite. It was pos- 
ten thin sections was prepared from specimens which a el 
of piaesiee as pure as we were "able to obtain, has bees 
analyzed by Mr. Horace L. Rai with the istowing result :— 
Mean. Ratios 
Si0, an bis 20°72 "B45 
Os 14°71 14°64 14°67 “158 
FeO; 67 67 2°6 016 
eO 19°48 19°65 19°56 272 
MnO 2°21 ‘23 2°22 031 
MgO 5°22 5°16 5°19 130 
Na,O 0°51 eer 5 
K,0 0°09 enue 09 001 
Li,0 fr. Kee. 
CaO 12°40 = 12°27 12°34 220 
P.O; t 8:87 622 
5 3°94 3°89 A 
8°83 8°84 “491 
