98 ROCHESTER ACADEMY OF SCIENCE. [June 23, 
Drs. Lane and Patton have reported, as before, on the special features of the minerals 
composing this meteorite, and the results of their work are given below : 
Feldspar.—Playioclase. 
There is but little feldspar present, and in its general characters and inclusions it is 
like the Llano form. It is considered to be basic on account of its interference colors 
being as high asare those of the pyroxene. It shows the albite and more rarely the pericline 
twinning. Since the symetrical extinctions are positive and make an angle even greater 
than 45°, the feldspar is considered to be anorthite. 
Pyroxene. 
The pyroxene here is of two kinds—one a reddish monoclinic form having a strong 
double refraction, and the other a colorless rhombic form with a weak double refraction. 
The first form is diallage or augite, and the latter enstatite, with the extinction parallel to 
its cleavage planes. 
The intergrowth of the two minerals is not in the usual longitudinal strips common 
in intergrowths of diallage and enstatite, but is very irregular and patchy, resembling the 
micropegmatitic or granophyre structure. 
The enstatite cleavages are marked by cracks whose wall are stained with ferru- 
ginous material. One cross section was seen having a bisectrix and axial plane diagonal 
to the cleavage. -+2V is large. 
Olivine. 
This mineral is rare and occurs in irregular grains looking much like the enstatite, 
but shows much higher colors. Its cracks are stained with iron oxide. Optically it shows 
high refraction, with low double refraction and appears to have a large optical angle with 
a negative acute bisectrix. 
Magnetite. 
This is abundant in one section and surrounds the iron. It shows the usual charac- 
ters of magnetite. 
Pyrrhotite (Troilite). 
This is opaque, bright and of a yellowish bronze color. Its form is irregular, and it 
is mixed with the magnetite. 
Tron. 
This mineral is abundant in one section, although less so than the magnetite. It 
shows the usual characters of the meteoric metallic iron. 
Alteration Products. 
A great amount of reddish and yellowish oxide of iron is present along the cleavage 
planes and cracks in the silicates. In one place there is an elongated body composed of 
iron oxide on the exterior, with a carbonate (?) interior and an intermediate portion of a 
greenish mineral having low interference colors. It appears to have too high an index of 
refraction for chlorite or for serpentine. 
It will be seen (p. 97) that Dr. Wadsworth is inclined to 
regard these meteorites as distinct, and makes a strong point of the 
difference in structure and composition. When he will have had 
opportunity to examine the etched nodules of iron from the two 
meteorites, I think he will find it hard to believe that they come from 
distinct masses. The identity of structure in the iron nodules has 
more significance than the dissimilarity in the stony portions. 
