224 TRANSACTIONS OF THE [MAY 7, 
Tremolite. This mineral was formerly obtained at Thompson’s 
Quarry, 196th street. 
At present the principal source is in boulders, in stone walls 
and elsewhere. 
The east bank of the Harlem has furnished fragments of dolo- 
mite showing fair specimens. 
Specimens also appear at the quarry on Central avenue. 
Actinolite. Good specimens from boulders used in macada- 
mizing, Seventh avenue at 130th street. 
At the anthophyllite locality, 63d street, Twelfth avenue. 
Anthophyllite (hydrous), analyzed and named by Dr. Wm. 
Thomson of Glasgow. By Prof. J. D. Dana it is considered an 
altered asbestiform tremolite. 
Abundant in veins in serpentine, W. 60th street. 
Asbestus, at the anthophyllite locality. 
A white variety near Spuyten Duyvil. 
Amianthus (silky asbestos). In serpentine boulders, Amity 
street (I. C.) and West 58th street. 
Mountain Cork, in boulders, Amity street (I. C.). 
Byssolite, a green, silky variety associated with epidote like 
that from Italy, 55th street, cor. Broadway. 
Fibrous Hornblende, 43d street, Second avenue. 
Beryl. In small yellowish-green crystals in oligoclase, ‘Tenth 
avenue near Hebrew Orphan Asylum. 
Aquamarine, amass of the transparent sea-green variety of 
bery! known by this name has yielded a lapidary several interest- 
ing gem-stones. From Washington Heights. 
Large finely shaped crystals from granite vein in gneiss, 
Fort George. Collection of G. F. Kunz. 
White and also a very light green variety of opaque beryls, 
found in a granitic vein, the feldspar of which was changing to 
kaolin; First avenue above 42d street. 
The early writers on New York minerals did not hesitate to 
call the deep colored beryls emeralds. Robinson speaks of the 
island as one of three localities in the Union affording emeralds, 
the others were Haddam, Ct., and Paris, Me. 
Anhydrous— Unisilicates. 
Garnets. Garnets are observable in very many localities 
throughout the county. They are usually opaque and of a dark- 
red color. Fine specimens are not common. 
