1884. 49 Leas. IN. Y¥. AG. Sct. 
under prevailing circumstances. These crystal masses, when scat- 
tered over the white dolomyte, afford the collector pleasing contribu- 
tions to his cabinet, rarely surpassed by any of our local specimens. 
The history of this ripidolite formation is worthy of a more com- 
plete investigation than it has yet received” 
The Jerome Avenue quarry may be announced as a new locality for 
Tremolite. 
It is to be hoped the supply may be considerable, as the Kings- 
bridge locality has long since been abandoned. 
After gleaning in the above locality specimens of ripidolite and 
tremolite, the collector will perhaps add to his stores what fragments 
of Quartz may fall in his way. Most of these display drusy surfaces 
in yellowish and brownish tints, due to the presence of iron. Others 
are clear and brilliant, the crystals of a larger size, but showing pyra- 
midal faces only. One specimen, showing an association of Blende 
and Auftile, indicates that a keen eye may be used to advantage in 
future observations, as the work of quarrying progresses. 
Associated with the beds of dolomyte in North New York appear 
masses of Actinolite rock, furnishing crystals of considerable merit. 
The forms are long and slender, in color an olive green. Good 
terminations are quite abundant. 
Within the past year further progress has been made in removing 
the rock masses at 120th Street and Fourth Avenue. The delicate 
blue Zourmalines (probably the /udicolite referred to by Prof. Web- 
ster) may occasionally be obtained in limited quantities. 
The mineral sometimes appears a mere cloudy spot of sky-blue 
tint, easily recognized. 
Also noticeable at this locality is the Orthoclase, of a deep red color, 
especially brilliant in the vicinity of certain lines of fracture. 
The varieties of Mica obtained by the writer in our neighborhood 
are thus far ten in number. 
Among the latest obtained is a Muscovite, of decidedly grass green 
tint, found on Ninety-third Street near Eighth Avenue, also near the 
Convent on 127th Street west of Eighth Avenue. 
At the Jerome Avenue Quarry I found traces of a delicate drown 
mica—peculiar to the dolomyte beds. That found near Morrisania 
is of a deeper color. Near the latter locality 1 have secured some 
interesting finely shaped crystals of muscovite, also fragments of 
Biotite. 
Staten Island is noted as one of the chief localities of minerals of 
the amphibole family. The list has not hitherto embraced Mountain 
Leather; \ have the pleasure to report finding specimens during the 
past summer at the iron mine near Clifton. 
4 
