230 TRANSACTIONS OF THE [May 7, 
Radiated groupings (termed ‘‘sunbursts” by the Irish labor- 
ers). 56th street, between Broadway and Seventh avenue. 
Similar specimens on quartz. New Aqueduct shaft No. 
8 
Very handsome specimens (collection of G. F. Kunz). Wash- 
ington Heights, 1888. 
Groups of radiated crystals, increasing in size as they pro- 
gress from point of radiation. Washington Heights, near In- 
wood. 
In profusion on the walls of a fissure in gneiss. Small 
radiated groups of acicular crystals. 122d street and Madison 
avenue. 
Brown Tourmaline. Thompson’s Quarry, 196th street; Har- 
lem Canal. 
Green prisms, small and slender in size, noticed in association 
with the brown variety (W. EK. H.). Harlem Canal. 
Fibrolite. In whitish fibrous blades, at 117th street and 
Fourth avenue. 
Has been noticed also at Washington Heights. 
At 52d street and Madison avenue (J. D. Dana). 
Dumortierite. (Determination by J. D. Dana, and by J. S. 
Diller). 
One of the most interesting minerals of the island. Often 
thought to be a blue variety of tourmaline; probably the indi- 
colite of Prof. J. W. Webster. 
In acicular crystals of a beautiful ultramarine blue color, 
aggregated in fasces or tufts resembling clippings of hair. In my 
possession are the largest crystals yet discovered; perhaps 4 
inch in diameter. ‘The mineral is sparingly distributed 
through a lode of red granite extending southeastwardly from 
Fourth avenue at 123d street to Madison avenue at 116th 
street. 
Noticed by S. C. H. Bailey, at Kip’s Bay, 1865. The same 
mineral I have also discovered in white oligoclase near the upper 
end of Riverside Park. 
Also reported to have been found on Tenth avenue at 130th 
street. 
Kyanite. Sparingly at the Turtle Bay quarries. 
In excavations for new buildings, Columbia College grounds, 
49th street and Madison avenue. Previously found at same 
locality by F. 8. Cozzens (I. C.). 
In excavations at 42d street and Park avenue, opposite the 
Grand Central Depot, small pale blades, so abundant in the rock 
