366 Brush and Dana—Fairfield County Minerals. 
Scorodite FeAs,0, +4aq. 
Strengite FeP,O, + 4aq. 
ingite Mn, P.O, + 2aq, 
It is thus seen that reddingite differs from the other species in 
that the metal is in the protoxide condition, and again since 
there are only three equivalents of water present. In order to 
establish beyond all question that this difference was a real one, 
we have had a second analysis made. The material was 
selected from another specimen, and as before, was obtained 
free from all impurities cos sees 
The analyses, made by Mr. Horace Wells, are given 
below (A) as also that by him iB) ortaied in our preceding 
gst eee 
ai . 
"Sloe 
ar 33°58 See) 35°16 34°52 
F 754 ae 7-389 5°43 
MnO 41°28 Pascua 43°22 46°29 
CaO 0°67 das 71 O°7 
Na,O trace ae ee 0°31 
31-42 11°72 12°27 13°08 
Quartz 4°46 - 
99°25 99°25 100°41 
The new analysis leads to the formula Mn,P,O,+3agq, or the 
same as that obtained before. The only “marked difference 
between the two results 1s'one which we have found to character- 
ize all the species of the locality, that is, a little variation in the 
relative amounts of iron and manga nese. That the manganese 
is really in the protoxide condition cannot be questioned for a 
moment. 
pen a 
It seems of some interest to place together the hee new 
species which the locality has afforded us. We shall hope, 
at some future time, to offer some remarks in rege’ to their 
single hand- ra ism which exhibit all of the first four 
minerals toget 
1. EOSPHORITE. Orthorhombie. 
R.AIP,0, Oy 4H,0, or AIP. 2Ou+ 2H.Mn(Fe)0.2 + 2aq. 
2. TRIPLODDITE. Monoclinic. 
R,.P200, H.O or Mn,(Fe;)P.0;+ Mn(Fe)(OH)s 
3. DICKINSONITE. Monoclinic. © 
4(RsP.0.), 3H,0 or 4(Mn, Fe, Ca, Naz)sP20s + 3aq- 
