36 AMERICAN MUSEUM GUIDE LEAFLETS 
and bears a close and interesting resemblance to the terrestrial basaltic 
igneous rock peridotite. “The content of chromite (9 per cent of the 
whole) is remarkable and is the highest yet reported in meteorites. 
Long Island presents a feature heretofore unknown in meteorites. 
Certain of the planes of fracture show striated surfaces with grooving 
and polishing (slickensides) due to the parts grinding together in their 
LONG ISLAND 
Slickensided surface showing movement in the mass before it fell. 
flight through space before the mass reached our atmosphere. ‘l'wo 
of the pieces in this case show such slickensided surfaces and one of them 
is illustrated on this page. 
Other fine specimens of Long Island may be seen in the general 
meteorite collection on the fourth floor of the Museum (Hall No. 404). 
