1891.] Mineralogy and Petrography. 659 
MINERALOGY AND PETROGRAPHY.! 
New Minerals.—Agui/arite.—A new regular mineral from Guan- 
ajuato, Mexico, has been named by Genth? aguilarite. It is imbedded 
in colorless calcite as brilliant iron-black skeleton dodecahedrons, 
elongated in the direction of one of the crystallographic or one of 
the octahedral axes. The mineral is sectile. It possesses no cleavage, 
has a hardness of 2.5 and density of 7.586. Its composition (Ag = 
_ 79-07; S= 5.86 ; Se = 14.82) corresponds to Ag,S+Ag,Se. Upon 
alteration it yields a scaly iron-black substance, with the composition 
of cupriferous stephanite, and metallic silver. Griphite.—In the 
granite at the Riverton Lode, near Harney City, South Dakota, occur 
kidney-shaped masses of a phosphate, dark brown in reflected light, 
and yellowish-brown or brown in transmitted light. It is amorphous, 
and has no cleavage. Its density is 3.401, and its hardness 5.5. It is 
easily fusible in the flame of a candle, and is soluble in acids. Its 
composition, as found by Mr. Headdon,? is: 
P,O, MnO CaO Al,O, FeO MgO Na,O K,O Li,O H,O Ce F Ues 
38.52 29.64 7.47 10.13 4.00 .15 5.52 .30 tr. 4.29.11 tr. .16 
On account of its composition, which cannot be represented by a 
simple formula, the author calls the substance griphite, from yptgos, a 
puzzle. Katiborite* is associated with pinnoite and boracite in the 
upper layers of the Kainite zone at Stassfurt, Germany. It is a white, 
granular substance with a density of 2.05. It is slightly soluble in water, ` 
and dissolves easily in dilute acids. Its composition is : 


BO. M0 KO HO =k Met HO 
57:40 1200 6.46 24.00 8 * E Bau t 391,0. 
e new mineral falkenhaynite, described by Scharizer® from 
Joachimsthal, Bohemia, is regarded by Sandberger ĉas a member of 
the bournonite group, differing from annivite in containing more 
antimony and less arsenic than this latter, and almost no bismuth. Its 
composition, as found by Scharizer, is: . 
wae S As Wi Ca Fe On 
25.76 44:30 5.02 244 39:77 253 1.909 
1 Edited by Dr. W. S. Bayley, Colby University, Waterville, Me. 
2 Amer. Jour. Sci., May, 1891, p. 401. * 
8 Amer. Jour. Sci., May, 1891, p, 415. 
t Chemkier Zeits., 1889, p. 1188. Ref. N. J. B. f. Min., etc., 1889, I., p. 237. 
5 Jahrb. I. K. K. Geol. Rich., 1890, p. 433. 
ê Neues Jahrb. f. Min., etc., 1891, L., p. 
p eE E ie : sios ees 

