PD A ee NT ET 
Brush and Dana—Fairfield County Minerals. 1238 
phoric acid in excess with pure magnanese carbonate. He 
gives, however, no description of the form of the crystals 
obtained. 
The close correspondence of reddingite with scorodite and 
strengite has already been pointed out; chemically the relation 
is not so close, for the manganese is all in the lowest state of 
oxidation and only three molecules of water are present. The 
ormulas for the three minerals are as follows :— 
Reddingite Mn,P,0, + 3aq. 
Scorodite FeAs, 0, +4aq. 
Strengite FeP,0, +4aq. 
Pyrognostics.—On heating in the closed tube, whitens at 
first, then turns yellow an nally brown, but does not 
ecome magnetic. In the forceps fuses in the naked lamp 
flame (F=2). B.B. colors the flame pale green and fuses 
easily to a blackish-brown non-magnetic globule. Dissolves in 
the fluxes and reacts for manganese and iron. Soluble in 
hydrochloric and nitric acids. 
Concluding note. 
_ In a second paper upon this locality which we expect to pub- 
lish within a few months we shall describe under the name of 
Jairfieldite a sixth new species, whose character has been deter- 
mined too late to find a place in these pages. It is a hydrous 
phosphate of manganese and lime, having the formula R,P,O, 
+2H,0, where the protoxide elements are manganese and lime 
chiefly ; also iron and soda in small quantities. Fairfieldite is 
a yellowish-white to colorless transparent mineral, with an 
adamantine luster on the surface of eminent cleavage; the 
hardness is 35, and the specific gravity is 8°15 
i i ipti 1, so far as possible, 
analyses of the other associated minerals, as, rhodochrosite, 
hebronite, the black massive products of decomposition and 
other species of special interest. 
