1888. | NEW YORK ACADEMY OF SCIENCES. 221 
Gypsum. Selenite crystals on a boulder. Harlem Common 
Le 
hein Crystallized and amorphous in feldspar, Corlear’s 
Hook (Rob.). 
In greenish prisms in granite “‘ near the city” (Rob.). 
A few fine crystals, associated with beautifully crystallized 
mica and octahedral pyrite, Kip’s Bay Quarries (S. C. H. B.). 
Broken crystals of rich green color, 42d street, Second and 
Third avenues. 
Beautiful deep green crystals of small size, Washington 
Heights. 
Crystal, six inches in length, injured in extraction from 
gangue, 122d street, near Riverside Drive. 
Transparent white crystals, with albite and chlorite, similar 
to specimens from Piedmont, H. 38th street (S. C. H. B.). 
Microlite. Small octahedron in oligoclase, 39th street, Sixth 
and Seventh avenues (W. E. H.). 
Calcite. In veins in serpentine, 58th street and Tenth 
avenue. 
In veins in dolomite, St. Ann’s avenue and 145th street. 
Crystallized, in thin, white rhombic plates, aggregated ina 
series of cells; beautiful specimens. Harlem Tunnel, 1874. 
Dog-tooth spar, sparingly, St. Ann’s avenue quarry. 
Brown calcite (?). A deposit of this variety was reached some 
years since in grading Fifth avenue at 105th street. Unfortu- 
nately, the excavations were shallow, affording collectors a glimpse 
only of a choice store of interesting minerals imbedded in the 
spar. These were rutile, sphene, globular chlorite, garnets, etc. 
Oolite, found by F. 8. Cozzens, Corlear’s;Hook. 
Aragonite. In radiated groups of yellow prisms several 
inches in length, Fourth avenue and 96th street (S.C.H.B.). 
White, in veins in dolomite, a fibrous variety, the fibres lying 
transversely, St. Ann’s avenue and 145th street. 
Flos ferri, Fourth avenue, 1874. 
Dolomite. New York county is situated on the noted line 
of dolomite beds extending from Vermont to N. Carolina. Per- 
haps a dozen of these deposits are within the limits of the 
county. ‘lhe most southerly beds of importance are at Lexing- 
ton avenue and 120th street ; Madison avenue and 135th street; 
Mott Haven, near Madison avenue bridge. 
Good crystallized specimens of the mineral are rarely found 
