1888. | NEW YORK ACADEMY OF SCIENCES. 227 
avenues; 45th street and Second avenue; 43d street, Second 
and Third avenues. 
Also in dolomite at junction with gneiss, Brook avenue and 
145th street. 
Good crystals, Riverside Park. 
Masses of small crystals, 63d street and Broadway. 
** Snear Mica,” 43d street, Second and Third avenues. 
Prismatic, do. 
‘* Picture” mica, excellent specimens, some 12 inches in 
length, Riverside Drive and 120th street. 
Striped and banded, parallel to sides of crystals, in some cases 
a rich blue (S. C. H. Bailey), 45th street and Second avenue; 
40th street, Second and Third avenues, and various localities. 
White or silvery (perhaps sericite or a similar variety), 96th 
street and Third avenue; 101st street and Lexington avenue; 
126th street and St. Nicholas avenue. 
Green, 93d street and Ninth avenue; 101st street and Lexing- 
ton avenue; Convent Ground, Highth avenue and 128th street; 
Fort George, and elsewhere. 
Golden-yellow, in small leaves, in a very white oligoclase, 
found in paving-material, Boulevard at 63d street. 
Phlogopite. Generally in small scales. Good crystalline 
shapes are quite rare. Color, a handsome light-brown. 145th 
street and St. Ann’s avenue, Kingsbridge Quarries; very light 
color, Quarry, Central avenue. 
Biotite. Good crystals, 3 inches long, usually distorted 
rhombic prisms, Seventh avenue and 135th street. 
Handsome rhomboidal specimens, like those from Brevig, 
Norway (S. C. H. Bailey), 57th street. 
Pocket of rich black crystal masses, 56th street, between 
Sixth and Seventh avenues. 
Quite abundant in vicinity of Brook avenue and 138th street. 
Scapolite Group. 
Seapolite. Abundant in the localities below named. Good 
crystals are rare and of so frail a nature as barely to permit re- 
moval. Lexington avenue and 100th street, Fifth avenue and 
100th street; also of a firmer quality, Fort George. 
Feldspar Group. 
Oligoclase. Found in many localities where blasting opera- 
tions occur. 
In laminated plates showing striations on the edges. Color, 
white, light green, and bluish. 
