908 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiv 
mass open it is found to consist of metallic iron and olivine, both in 
such quantities as to be readil}^ determined by the unaided e^-e. Cut 
and polished specimens show it to be a pallasite and to belong to 
Brezina's Rokicky group, of which the meteorite of Eagle Station, 
Carroll Count}^, Kentucky, is the only representative thus far found 
in America. In fact, the Admire meteorite is the third representative 
of the group thus far known. 
A polished surface brings out very plainly the mineral composition, 
and presents some exceedingly interesting structural peculiarities. 
(Plates LI and LII.) The silicate mineral is olivine, which occurs in 
single crystals and aggregates from 1 to 30 millimeters in diameter. 
These are almost universally fractured, and many of them are in a 
decidedl}^ sharplv angular condition. The proportional amount of 
iron varies considerably, but as a rule probably constitutes one-third 
in bulk of the mass and occupies the position of a binding or cement- 
ing constituent. Schreibersite is comparatively abundant and easily 
distinguishable by its luster from the metallic iron. Troilite in 
sporadic patches is common, and there is also a fairly abundant scat- 
tering of chromite granules in sizes up to li millimeters in greatest 
diameter. All but the last named are readily distinguished bv the 
unaided eye on a polished surface. 
A freshly cut surface of the meteorite shortly becomes coated here 
and there with a greenish exudation which reacts for chlorine and 
iron, and is undoubtedly lawrencite. This exudes sometimes from 
the mass of the iron itself, but is more a])undant along the line of 
separation between the iron and schreibersite plates. It is very 
abundant and undergoes such ready oxidation that polished surfaces 
are quickly tarnished, and it has become necessar}^ to protect the sam- 
ples by immersing them in paraffin. Once thoroughly soaked in paraf- 
fin, however, they do not seem to undergo further deterioration. 
The above completes the list of determinable mineral constituents. 
A most striking feature of the meteorite is the ])recciated condition 
of the olivine, as shown in Plates LI and LII. The angular character 
of the particles is even more pronounced than in the Eagle Station 
meteorite. The brecciation, however, is scarcely that of a rock which 
has been subjected merely to ordinary crushing; it is more like that 
which one could conceive to have been brought about b}^ the sudden 
plunging of a hot body of low heat-conducting power into an intensely 
cold medium, or the opposite. 
A very important feature is that the native iron, schreibersite, and 
troilite often penetrate the silicates along these lines of fracture, as 
shown in Plate LIII, tig. 1. The threads or veinlets of iron and schrei- 
bersite varj^ from a mere line to a width of 1 or 2 millimeters, and 
indicate beyond question a solidification and perhaps reduction subse- 
quent to the shattering of the crystals. Under the microscope what 
