1884. 49 Trans. N. V. Ac. Set. 



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 

 Tremo/ife. 



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 Q7iartz 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 Rjitile, 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 Tourfnalines (probably the Tndicolite 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 brown 

 mica — peculiar to the dolomyte beds. That found near Morrisania 

 is of a deeper color. Near the latter locality I have secured some 

 interesting linely 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; 1 have the pleasure to report finding specimens during the 

 past summer at the iron mine near Clifton 



