The Monoclinic Pyroxenes of New York State. 165 



CaFeSizOg. 



4(CaAl2 SiOe) 



35(CaMgSi206) 



Mg Si03. 



C:C. 40° 



a 1.6778 



P 1.6848 Na. 



y 1.7025 



7— a .0247 



2 W == 75° 50^ 



2V= 59° 



Kingshridge^ New York Co. — Most of the crystals from the 

 dolomite are considerably decomposed and replaced by granular 

 dolomite. They resemble the Sing Sing specimens exactly. There 

 is one exceptionally large one in the Columbia University collec- 

 tion. It is four inches long and two inches wide and has a 

 smaller one penetrating it. 



Paterson, Dutchess Go. — The quarries northwest of the station 

 have furnished a considerable number of these tabular leucau- 

 gites. Mr. Nason has in his collection a fine group of small 

 glassy crystals from this locality. They show the usual combina- 

 tion, a (100), 6 (010), m (110), v (231), o (221) c (001), and p (TOl). 



According to Beck (Ref. 2) crystals twinned parallel to both a 

 and h (010) have been found in Knapp's quarry, at Paterson. The 

 crystals often have the granular structure of the dolomite, and 

 are sometimes broken into several pieces, the dolomite filling in 

 the breaks. 



PhillijDstoivn, Putnam Co. — According to Beck (Ref. 2) white 

 pyroxene has been found on the Hustis farm. It is translucent 

 and sometimes light green. Serpentine and pale green apatite 

 are occasionally associated with it. 



HUDSONITE (HeDENBERGITE ?) 



West Point, Orange Co. — A black lamellar variety of pyroxene 

 associated with quartz, black or bronze mica, and feldspar occurs 

 on the west bank of the Hudson river about three miles above 

 West Point. A specimen analyzed by Vanuxem, (Ref. 53) gave: 



Annals N. Y. Acd. Sci., IX, June, 1896.— 12 



