118 Brush and Dana—Fairfield County Minerals. 
Another analysis by Mr. Penfield on a separate sample of 
dickinsonite is given below, the lime having been lost is 
determined by difference. The results are ——* as before: 
rite ‘present: (3 ast after deducting a and (4) the 
final result pais again to 100. 
ee Reetcrie ~ o 
and quartz. 
P,0; 38°18 2-13 36°05 39°53 
AlO, 1°55 1°55 
FeO 11: 50 10°86 11°90 
MnO 23°48 1°63 21-85 23-96 
CaO [13-67] [13-67] [1498] 
K,0 67 67 
Na,O 436 4°36 4°78 z 
H,O 4°62 1-08 3°54 3-88 
Quartz 1°89 1°89 
100-00 8°78 91-22 106000 
Pyrognostics.—In the closed tube gives water, the first por- 
tions of which react neutral to test paper, but the last portions 
are faintly acid. The residue is magnetic. Fuses in the nak 
lamp flame and B.B. in the forceps colors the flame at first 
There is no known phosphate, so far as we are aware, which 
bears any relation to dickinsonite in crystallographic character, 
and in chemical composition it seems also to be without any 
very near relatives 
We have named this most interesting mineral dickinsonite in 
honor of the Rey. John Dickinson of Redding, Conn., our 
obligations to whom we have already acknowledged. 
4, LiTHIOPHILITE. 
The occurrence of this mineral in the deepest explorations 
made has already been mentioned. ae is found im 1 
albite in irregular rounded masses one to three inches in nate 
eter and coated with a black ee ie result of its own oxi- 
dation some of these masses have only a small core of unaltered 
Phas characters.—No eyaals of lithiopbilite were found, 
although some of the imbedded masses have in external form a 
pecs at phones aspect. There are three distinct cleav- 
: one quite perfect, always observable whenever the mineral 
is = broken 5 ik cond nearly perfect at right angles to the first ; 
a third in terrupted, which is Pap having an angle of 
128°-130°, and inclined at right angles to the first named cleav- 
age, and 115°-116° to the second. ~ salacas: in composition 
