226 TRANSACTIONS OF THE [MAY 7, 
Melanite, black garnet, found in cavities in boulders of meta- 
morphosed sandstone, Manhattanville. 
Zircon, in granite. Washington Heights (W. E. H.). 
Idocrase [?] (Rev. E. Seymour). Dull green crystals in meta- 
morphosed sandstone. 
Epidote. Epidote rock is occasionally noticed throughout 
New York County. It is generally associated with hornblendic 
gneiss. A prominent locality is now covered by the Navarro 
Flats, 59th street, Sixth and Seventh avenues. 
Abundant also at 100th street, Lexington avenue, Fort George 
and elsewhere. 
Granular massive, 37th street, between Third and Lexington 
avenues, and elsewhere (D. S. Martin). 
Bright green crystallized specimens have been obtained on 57th 
street, West of Ninth avenue; Lexington avenue, 44th street ; 
56th street, Sixth and Seventh avenues; 55th street, Sixth and 
Seventh avenues; Harlem Tunnel. 
Abundant at railroad cut, Spuyten Duyvil. 
Crystal 14 inches in length, good color, 59th street, Sixth and 
Seventh avenues. 
Remarkably good prism for this locality, 1 inch long, 4 inch 
in diameter, Fort George (Wm. Niven). 
Orthite. One of the most notable minerals about New York, 
embracing in its composition the rare elements, Lanthanum, 
Didymium, Cerium, and Yttrium. 
The crystals are dark reddish brown to black in color, of a pitchy 
lustre, often bent and twisted, set in white oligoclase, which is 
usually stained red in the vicinity of the crystal. Found 
at one locality only, 56th street, near S. E. corner Broadway. 
Iolite. First found by Wm. Niven, but identified and de- 
‘scribed by W. E. Hidden. Planes O, 1, i-3(?), and on the 
‘other prism, O ql = 133° (132° 12’, Dana). ‘The specimen is 
‘divided into basal sections. Diameters 1 x 14 inches. Color 
‘grayish-green. Hardness 4. From Fort George. 
Pinite. An altered iolite from the same locality. 
Mica Group. 
Muscovite. In large hexagonal crystals, twelve or fifteen 
inches in length. Found in excavating site for car-stables, 
Sixth avenue and 45th street. 
Good crystals, one nearly the size of the above, ‘Tenth avenue 
and 130th street. 
Finely shaped crystals, 56th street, Sixth and Seventh 
