Brush and Dana—Fairfield County Minerals. 367 
4, LITHIOPHILITE. Orthorhombic. 
LiMnPO, or LisPO,+ MnsP,0s. 
5. REDDINGITE. Orthorhombic. 
R;P20,, 3H,O or Mn,(Fes)P20.4 + 3aq. 
6. FAIRFIELDITE Triclinic. 
RsP20sg, 2H.0 or Ca3(Mnsz, Fe;)P203 + 2aq. 
7. FILLOWITE. Monoclinic. 
3(RsP205), H.O or 3(Mn, Fe, Ca, Naz);P20.+ aq. 
Altered Lithiophilite. 
In our former paper we called attention to the large amount 
of black oxidized material rich in lithia which was associated 
in the first deposit with eosphorite, triploidite and dickinsonite. 
We stated also, that the occurrence of this black substance 
induced us to make the deeper exploration which resulted in 
the discovery of lithiophilite. We have now made a more 
critical examination of this black mineral, and have found on 
case seems to be proved by the fact that the black variety can 
be made to assume a purple hue by dipping it in hydrochloric 
acid; the mass so encanta 
: e 
unaltered lithiophilite, and was analyzed by Mr. F. P. Dewey, 
in the Sheffield Laboratory, G.=3:39—38°40. 
