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Brush and Dana—Fairfield County Minerals. 45 
date, determined, deducted from the weight of the latter and 
added to the phosphoric acid determination. The results of 
two analyses are: 
Relative number of atoms 
1. Tk Mean. calculated from the mean. 
P30; 32°14 32°08 $2°1] 
FeO 15°07 14°69 ....- 14°88 207 
MnO 48°35 48°55 48°45 *682 } 895 3°96 4° 
CaO 36 *29 ‘So “006 
H,0 4°01 4°15 4°08 "226 100°"'T- 
99°93 99°76 99°85 
The ratio P,O, : RO: H,O = 1:4:1 corresponds to the form- 
Bhs Fahl +H, ‘O, or R ig O,+H,RO,, where R=Mn: Fe 
:1. ‘This formula requires : 
P,0; 31°91 
Fe0 16°18 
MnO 47°86 
H,0O 4:05 
100-00 
Among the other phosphates and arsenates rit rena a 
seem to be closely related to gene in compositi 
Libethenite Cu,P,0; +H,Cu0, Ort oar 
livenite Gag da) + Ha0u0, thee 
ite AIP,O 
triploidite immediately suggests itself The composition of 
these minerals is 
Watacths Mg;P.0,+MgF, 
Triplite (Fe, Mn iy sP,0, +(Fe, Mn) F, 
Triploidite (Mn, Fe),P,0, +(Mn, Fe) (OH), 
Hitthatory brinents were it Fripeited: The conclusion to which 
we are led is this—that in the compound triploidite the radical 
hydroxyl (OH) plays the same part as the sheen fluorine, the 
molecule R(OH), taking the place of the RF. 
Pyrognostics—In the closed tube triploidite gives neutral 
water, turns black and becomes magnetic. Fuses quietly in 
the naked lamp flame and B. B. in the forceps, colors the flame 
green. Dissolves in the fluxes, giving reactions for manganese 
and iron. Soluble in acids. 
