Brush and Dana—Fairfield County Minerals. 365 
Chemical properties.—The analyses of fillowite by Mr. S. L. 
Penfield afforded the following results :— 
i Mean, Ratios. 
Be OF 39°06 39°16 39°10 215 2°75 1 
FeO “48 91 33 “129 
MnO 39°48 39°36 39°42 555 
CaO undet. 4:08 4:08 073 851 3°09 
ay 5 5°84 5°74 092 
0 
The tatio PLO. = Os 1:3:4, corresponds to the 
formula 3R,P,0,+H,O. If in this formula R = Mn: Fe: 
Ca: Na, = 6:1:1:1 the calculated percentages are :— 
gages 7 40°19 
FeO 6°80 
MnO 40°19 
CaO 5°28 
Na,O 5°84 
H,O 1-70 
100°00 
The very small amount of water present suggests the question 
as to whether it is really an original constituent of the mineral. 
- This question we have been unable to decide positively ; we 
REDDINGITE. 
In our preceding paper we described the new mineral red- 
dingite, and showed that in the habit of its octahedral crystals 
and in their angles it was closely homceomorphous with 
Scorodite and strengite. In composition, however, it was shown 
that there was a variation, as ee — 
