1891.] _ Mineralogy and Petrography. 371 
tions deposit crystals with the properties of aragonite. The crystals 
of evrite, from Dillenburg, Nassau, fall into two classes. The first 
includes well-developed prismatic forms with large macrodomes (P o) 
on both terminations. The others are prismatic with P4o and P38 
on one termination. The other is attached to the gangue. Their 
axial ratio is .6795:1:.4576. In the article by Messrs. Genth and 
Penfield “ referred to above appear analyses of picropharmacolite from 
Joplin, Mo., of a substance supposed to ————. from near 
Georgetown, N. M.; of pitticite from the Clarissa Mine, in the Tintic 
District, Utah ; and of giddsite from White Horn Station, Chester Co., 
Pa. The last-named mineral is discovered to be a hydrous aluminium 
phosphate. The pitticite corresponds in composition to 4Fe,As, 
O, Fe,(OH),+ 20H,O.—=The remarkable nfineral locality, Branch- 
ville, has again been reported upon by Messrs. Brush and Dana.” 
During the ten years that have elapsed since their previous report 16 ` 
extensive mining has been carried on at the locality for the purpose of 
obtaining quartz and microcline for technical uses, During the past 
two years large quantities of rare magnesian phosphates have been 
brought to light, and these have been investigated by the mineralogists 
mentioned. The’ minerals whose indentification is recorded are 
lithiophilite, hureaulite, reddingite, fairfieldite, dickinsonite, ai fillowite. 
The lithiophilite is in rudely crystalline masses in a vein, associated 
with albite, quartz, and spodumene. It is, as a rule, fresh. Occasionally + 
it is extensively altered into hureaulite through the intermediate prod- 
uct dickinsonite. The succession in age of its various decomposi- 
tion products, among which are all the other minerals mentioned 
above, could not be determined, as they seem to occur together pro- 
`- miscuously. The hureaulite, heretofore known only at Limoges, 
France, is in small monoclinic crystals, varying in color from violet to 
Sya red, and mra into parallel agpregatm. Their axial ratio is 
$$: ¢=1.9192: 1: .5245 with == 84° 1’, on the assumption of 
E plane 4 Ps. eed by Descloizeaux in the Limoges crystals as 
the RIN form. The habit of the Branchville crystals is short pris- 
matic, with œP and various pyramids well developed. The crystals 
have a good cleavage parallel to the orthopinacoid, a specific gravity 
of 3.149, and a composition as follows : 
TO- FO MnO CaO HO ose 
38.36 4.56 42.20 -94 12.20 1.76 
u Amer, Jour. Sci., Sep., 1890, p. 199. 
; 15 Amer. Jour. Sci., Mch., 1890, p. 201. 
16 Tb., 1880, p. 257. 
