ioo8 The American ISlaturaCisi. [November, 
A manganiferous chlorite from Villsalen contains 
SiO, Al,03 Fe,03 FeO MnO MgO H,0 
27.13 24.70 5.84 9.72 1.98 20.52 11.35 
Upon comparing the loss of arsenic consequent upon the heating of 
lollingite and arsenopyrite, Loczka^' concludes that the latter mineral is 
a compoimd of FeAs^ + FeS^, and that its decomposition by heat is 
effected as follows : 
(i) FeS, f FeAs, = FeS + S + FeAs, ; (2) FeAs, + S = FeS + 2 As. 
The mean of a lot of analyses of pinite^^ from the conglomerate 
of Boston yields. 
SiO, Al^Og Fe.Oj K,0 Na,0 CaO MgO H,0 Loss 
48.16 36.23 8.65 ,.39 .28 .91 4.51 -38 
Meteorites —Of very considerable interest to students of meteor- 
ites are two recent articles by Huntington. It will be remembered 
that this writer, in 1886, showed" that the Widmanstattian figures 
and Neumann lines on the etched surfaces of meteoric irons are sec- 
tions of planes of crystalline growth parallel to the cube, dodecahe- 
dron and octahedron, which planes are also the planes of easiest cleav- 
age for meteoric iron. In one of his recent papers^^ he shows that in 
the case of the Butcher meteroite (Coahuila, Mex.) the cleavage is 
parallel to the faces of an interpenetration cube. The surface pro- 
duced by fracture of this meteor is very different from the fracture 
surface of the Saltillo iron, and therefore the two must be regarded as 
representing different falls. On the other hand, the similarity in 
structure between the Saltillo, the Allen County, Kentucky, the Chat- 
tooga, and Maverick County, Georgia, meteors, is so striking as to lead 
to the conclusions^ that they must be parts of a single large body. In 
the last paper published by Huntington, the author declares that a sin- 
gle piece of the Coahuila iron presents the Widmanstattian or Neu- 
mann markings, or is amorphous, according to the portion of the 
mass from which the etched specimen is taken, and that, therefore, 
these markings cannot be depended upon as a means of classifying 
such meteorites. It is further shown that these markings, which have 
hitherto been regarded as characteristic of meteors, are present also on 
»Z«Vj. / Kryst, XV.. p. 40. 
"Crosby: Technology Quarterly, Feb. 1889. p. 248. 
