R22 TRANSACTIONS OF THE [May 7,. 
in the vicinity, nor has the author succeeded in finding anything 
of importance nearer than Pleasantville, Westchester Co. 
The dolomite deposits contain pyrite, chalcopyrite, rutile, 
chlorite, ripidolite, tremolite, brown tourmalines, quartz, mala-- 
colite, etc. Nearly fifty years ago, the Kingsbridge quarries 
were much resorted to by collectors. 
Pink dolomite. This beautiful variety, first found by Mr. A. 
P. Bjerregard, was exhibited at the N. Y. Academy of Sciences 
during the spring of 1887, and awakened much interest among 
collectors. Obtained from the dolomite bed at Mott Haven 
near Madison avenue bridge. 
Hydrodolomite. Morrisania, Kingsbridge. 
HYDROGEN. 
Water (Hydrogen Oxide). 
Chalybeate Water. A spring containing the above water 
situated on the ‘Incleberg’ (Murray Hill) grounds of Mr. Cos- 
ter, described by Dr. 8. L. Mitchill in Bruce’s Mineralogical 
Journal, 1814. 
A well of the same character is noted in list of I. Cozzens.. 
This was located on Highth avenue near 28th street. 
SILICA AND THE SILICATES. 
Silica. 
Quartz. Crystals in granite, Old Glass House Point (I.C.). 
Crystals in granite, Bellevue (1.C.). 
A few crystals nearly one inch in diameter and two inches. 
long, found at the orthite locality, Broadway and 56th street. 
Others of smallersize, 56th street, Sixth and Seventh avenues. 
Specimens showing terminal faces only, 138th street and 
Brook avenue. 
Crystals of unusual interest, for this locality, in collection of 
Mr. A. Woodward. 
In thin plates of aggregated pyramidal planes, interlaminated 
with dolomite, some specimens rather showy, many yellow or 
brownish, and some iridescent, Dolomite Quarry, Central 
avenue. 
Milky Quartz. In masses distributed through the gneiss, the 
surface often glaciated. Near Reservoir, Washington Heights. 
In broad vein in gneiss, much of it laminated. West Morn- 
ingside avenue. 
In other localities on First, Sixth and Tenth avenues. 
Smoky (Cairngorm stone), associated with kyanite, Lexing- 
ton avenue and 101st street. 
