202 
ME. N. STORY-MASKELYNE ON THE 
that appears to be due to certain minute interlaminated layers permeating the augite, 
hut which require the microscope for their exhibition. 
In whatever manner, whether as a constituent base in the augite itself, or as a foreign 
body interlaminated with it in the direction of the planes 0 01, 010, the evidence of the 
augite goes to confirm that of the analysis of the Osbornite, namely, that a metal nearly 
related to, if it be not titanium is present in both minerals. Possibly the minute inter- 
laminated mineral alluded to may consist of Osbornite of sufficient thinness to be trans- 
parent, and to give the colour alluded to. It is remarkable that the metallic sheen on 
the plane 10 0 of the augite is of a golden yellow by reflected light, and exhibits the 
bluish tint by transmitted light. 
It may not be out of place here to call attention to a singular golden-yellow incrus- 
tation, cubic in the form of its particles, obtained by Professor Mallet, of Alabama 
University, U. S. A., by heating metallic zirconium to an intense heat in a furnace with 
lime and aluminium. These crystals were not analysed, but it is not impossible that 
sulphur from the fuel might have supplied that ingredient, and that these crystals were 
in their nature analogous to those revealed to us in this meteorite, for like the Osbornite 
crystals they were not attacked by the strongest acids (see American Journal of Science, 
Series 2, vol. xxviii. 1859, p. 346). 
VI. The Augitic Constituent of the Busti Aerolite. 
Associated with the spherules of calcium sulphide that have been described as occurring 
in a nodule in this aerolite, and also less plentifully distributed through the rest of its 
mass, is the silicate, to which allusions have already been made as a variety of augite, and 
as containing traces of an element with some of the chemical characteristics of titanium. 
This silicate is of a pale violet-grey colour, intimately mixed in the form of crystalline 
grains with another silicate presently to be described. These crystalline lilac-grey 
grains, when isolated as much as possible from the other minerals, present a few crystal- 
faces, among which one as a cleavage-plane is prominent. The rest are very imperfect ; 
and it is extremely difficult to get any measurements that are at all reliable from them. 
The goniometrical observations, however, were sufficient, together with the optical cha- 
racters of the mineral, to determine that it belonged to the oblique system. These 
measurements gave the following approximate values : — 
001 
100 = 
about 
75 
30 
73 
59 
001 
110 = 
55 
81 
79 
29 
110 
100 = 
45° 
54' to 
47 
26 
46 
27 
110 
TlO = 
85 
8 „ 
86 
20 
87 
5 
100 
1111= 
53 
25 „ 
54 
15 
53 
50 
001 
110 = 
100 
8 
100 
57 
Those of rJiopsidc being 
