if 
OS ae ce 
Brush and Dana—Fairfield County Minerals. 117 
and normal to this yellow-green. No examination of a section 
perpendicular to the cleavage was possible, so that the position 
of the axes of elasticity in the plane of symmetry could not be 
determined. 
Chemical rene —The following analysis was made by 
Mr. 8. L. Penfield. The method of analysis was essentially 
the same as that already oe The purest material 
available was selected, but it was found impossible to ge 
it entirely from a little pi a quartz and eosphori The 
small amount of alumina present is assumed to Salone ‘to the 
eosphorite, and the calculations made accordingly. In the 
table below, column (1) gives the original analysis; (2) gives 
the amount of each constituent of the impurities to be deducted ; 
r r this deduction has 
and (4) the final composition after being averaged up to the 
original amount. 
¥¢ Romsvorite ~ - 
and quartz, 
P,0, 37°49 35°36 —- 39°36 
AIO; 1°55 155 
FeO 11-64 “50 1114 = 1240 
MnO 24°18 163 22°55 25°10 
CaO 12-00 1200 13°36 
Li,O 03 
K,O 0:80 0°80 89 
Na,O 4-71 4-71 5-25 
H,O 4°55 1:08 3°47 3°86 
Quartz 3°30 3°30 
100°25 10°19 90°06 100°25 
The ratio caleulated from analysis (4) is as follows :— 
P04 = oe yi § “227 1 4: 
FeO oa By 
MnU- == 7305 
Ca0 = = -238 
i.0 = ort Fe 8 
K,0 oo ae 
Na,O = ‘085 
H,O 271 3 NB: O31 
The ratio P,O,: RO: H,O =4:12:8 corresponds nf bn 
formula R,P,O, +4H,0. If R= Mn: Fe:Ca:Na= 
3:13; this ieerils requires : 
P,0O, = 40°05 
20). = 1369 
MnO: =. 26°04 
Cad oo hPa 
Na,O = 6°56 
H,O = 3°81 
100-00 
This corresponds as closely as could be expected with the 
se (4) given above. 
oun. Sct.—Tuirp Senizs, Vou. XVI, No, 92.—Aueust, 1878. 
