228 TRANSACTIONS OF THE [MAY 7, 
Large specimens of a white color quite abundant at 119th 
street and Lenox avenue. 
In handsome cleavage plates at 92d street and Fourth avenue. 
Light green variety at Riverside Park. 
Dark green variety at New Aqueduct Shaft No. 27, Wash- 
ington Heights. 
Blue variety at Harlem. 
White crystals at various localities. 
Light green crystals, large size, at 46th street and Second 
avenue. 
Albite. Quite abundant in region between Third and Fifth 
avenues, from 93d to 101st streets. 
Crystallized specimens at Fifth avenne and 100th street, Lex- 
ington avenue and 100th street. 
Cleavelandite. In boulders, Corlear’s Hook, and near city, 
40th street, Hudson River (I. C.). 
Orthoclase. This mineral, as one of the three constituents of 
the prevailing rock of the county—gneiss, is everywhere abun- 
dant. Conspicuous masses are, however, not so common, and 
the collector needs to avail himself of good opportunities for 
securing fine specimens of either the laminated plates or crys- 
tallized fragments. The feldspar varies in color from a dull 
white through different shades of yellow and flesh-color, to a 
bright red. Some of the localities were the following: 
In broad flesh-colored plates with highly lustrous surfaces, 
96th street and Fourth avenue; 56th street, Sixth and Seventh 
avenues. 
Brownish gray variety resembling perthite, 43d street, Second 
and Third avenues. 
Red, Fourth avenue and 120th street. 
Cream-colored, 46th street and Second avenue. 
White, 94th street and Third avenue. 
White, slightly opaline, Harlem Tunnel. 
Crystals are usually of the primitive rhombic form found lining 
fissures in gneiss. 
Good examples were obtained at 96th street and Fourth ave- 
nues, 56th street and Sixth and Seventh avenues, and Lexington 
avenue and 44th street. 
More highly modified forms and larger in size usually appear 
in granite veins. A few handsome specimens (in collection of 
Geo. F. Kunz). among which was a remarkable twinned crystal, 
were found at Fort George; also at 43d street and First avenue. 
At the latter locality the feldspar of the granite vein was chang- 
ing to kaolin. The mica and beryls present partook of the 
