1888. | NEW YORK ACADEMY OF SCIENCES. 233 
Many interesting specimens were, in the early spring of the 
year 1875, rescued by the writer just as the laborers’ carts were 
about removing them to barges on the East River for transporta- 
tion to distant points. Among interesting specimens were col- 
umnar forms with highly polished summits, others sprinkled 
with drusy pyrite, and masses of the mineral presenting cavities 
lined with chalybite. 
Large rosettes, of a dull yellow color, four inches in diameter, 
appeared at Hast 42d street. 
A white variety at Tenth avenue and 122d street. 
Additional localities, E. 43d street, First avenue and 63d 
street, Ninth avenue and 63d street, Eighth avenue and 108th 
street. 
Margarophyllite Section. 
Tale. In white and yellow scales, attracting the gold-seekers, 
60th street, N. R. (P. C.). Also found at Bellevue. Cream- 
colored, near 60th street and Tenth avenue (D. 8. Martin). 
Serpentine. An extensive bed of serpentine lies between 
the Hudson river and Tenth avenue, from 63d to 58th streets. 
It is usually of an olive-green color, at times nearly black. 
Intermixed with calcite, so as to present a mottled aspect, 
it is termed ophiolite. Clouded and veined specimens are known 
as verde antique. 
Precious serpentine, from the dolomite bed, Lexington avenue 
and 123d street. 
Chrysotile, fibres coarse and rather brittle, in the serpentine, 
W. 58th street (S. C. H. B.). 
Marmolite, with serpentine and anthophyllite, 63d street, near 
Eleventh avenue (D. 8. Martin). 
Metaxite (?). A curious radiated mineral of a yellowish-green 
color, regarded by Prof. G. W. Brush as near the above, obtained 
by the author at Fourth avenue and 117th street. 
Hydromica Group. 
Sericite (?). Supposed to be the proper name for a whitish 
or yellow-white mica abundant in the neighborhood of 100th 
street and Lexington avenue, and 96th street and Third avenue. 
Chlorite Group. 
Chlorite. In hexagonal plates, aggregated in globes in brown 
spar. Fifth avenue and 104th street. 
In laminated masses. Manhattan avenue and 104th street, 
also at 55th street, Sixth and Seventh avenues, 
