1888. | NEW YORK ACADEMY OF SCIENCES. 215 
Fifth Street. Here a bed of calcite yielded a few choice speci- 
mens of sphene, globular chlorite, the rarer zeolites, etc. 
The region in Harlem about One Hundred and Twentieth 
Street, Fourth Avenue and westward, is an interesting one. It 
is the chief locality of a mineral formerly known as indicolite, 
now proving worthy of a new title. 
Above the serpentine locality, the west side of the city has not 
proved of special importance to collectors. The laying out of 
Riverside Park afforded the writer good specimens of picture 
mica, in considerable quantity; also specimens of the new 
named mineral just alluded to. 
Above Manhattanville is a moraine, affording a great variety 
of boulders and pebbles, similar to the Corlear’s Hook “ alluvion” 
of ‘* olden time.” 
Washington Heights is proving a most interesting locality. 
A granite vein at Fort George has afforded many species not 
heretofore found in this locality, some of them being rare. 
Towards the northern end of the island the beds of dolomite 
make their appearance. That near Inwood affords malacolite or 
white augite. The next deposit forms a beautiful knoll, the 
site of the palatial Seamen residence, with its classic archway at 
the entrance, built of the dolomite quarried on the spot. 
The abandoned quarry (Thomson’s) at One Hundred and 
Ninety-sixth Street was a noted resort for collectors in the early 
part of the century. Rutile, malacolite, pyrallolite, phlogopite, 
brown tourmalines, and necronite were the principal minerals 
here obtainable. 
The Government improvements along the Harlem wili doubt- 
less renew opportunities for research among the dolomite 
deposits. 
Kast of the Harlem the beds of dolomite are numerous. That 
nearest to the Madison Avenue bridge in Mott Haven, referred 
to by Prof. R. P. Stevens in a paper read before this Society," 
has since been removed. Its northwestern extremity yielded a 
pink variety of dolomite which awakened considerable interest 
and discussion when first presented before the Academy. 
(Transactions, Vol. VI., pp. 39 and 91.) 
In the dolomite are occasionally found splendent and highly 
modified crystals of pyrite. 
In the accompanying list is a description of one secured by the 
writer which has been pronounced one of the rarest found on the 
continent. 
In the district lately added to the city, east of the Harlem, 
1 Published in Annals of the Lyceum, Vol. viii. 
