160 The Monoclinic Pyroxenes of Neto York State. 



s(lll) long and narrow, and o(221) small, (PL lY, Fig. 9.). 

 2(021) was noticed on the large crystal, but the face is a very 

 small triangular one. The small crystals are often transparent 

 and exhibited a beautiful green color similar to the one in Mr. 

 Nason's collection. 



The pyroxene at Tilly Foster is associated with a large lentic- 

 ular bed of magnetite occurring in the gray gneiss. In the 

 lower portion of the orebody is a great mass of massive horn- 

 blendic rock. The associated minerals are serpentine, chon- 

 drodite. fluorite, garnet, pyrrhotite, amphibole, ripidolite, tourma- 

 line and calcite. 



TtDO Ponds, Monroe township, Orange Co. — Beck states that 

 pyroxene of a gray-green, green or brown color occurs in lime- 

 stone at Two Ponds, (Ref. 2, p. 291). It is associated with 

 titanite, zircon and scapolite and is both massive and crystallized. 

 The crystals are usually only prismatic with rough ends, but 

 other combinations are a (100), 771 (110), &(010) and e(Oll); 

 a (100), m (110), b (010), c (100) and p (lOl); and m (110), ^ (TOl), 

 c (001). 



Warwick Township, Orange Co. — Pyroxene is very abundant, 

 near Edenville and Amity, and around Mts. Adam and Eve, a 

 short distance to the north. It occurs either in the contact 

 zones between the granite and the limestone or else disseminated 

 through the latter at some distance from the contact. The con- 

 ditions in passing from the granite to the limestones are as 

 follows : (Ref. 23) Near the contact the granite either becomes 

 an aggregate of green pyroxene and scapolite or a granite like 

 zone formed of the two is present. The limestone near the con- 

 tact is also charged with silicates in bunches or scattered through 

 it. These bunches are composed chiefly of brownish-green horn- 

 blende, dark brown biotite or phlogopite, green pyroxene, (light 

 green in section), titanite, pyrite, calcite and some scapolite. 

 Chondi'odite is also present sometimes and with it spinel. At 

 one localit}' where the granite and limestone are in actual contact, 

 the former contains pyroxene and scapolite and the latter coarsely 

 crystalline calcite and phlogopite. Fifteen feet from the contact 

 the granite has green pyroxene associated with quartz and micro- 

 cline. On the southwest side of Mt. Adam, the scapolite zone 

 contains large prisms of scapolite and pyroxene, the latter about 

 half an inch in diameter and often several inches long. The 



