Trans. N. V. Ac. Set. 130 Mar. 6, 



Datholite has been found mostly as druses or small crystals, which 

 were very plentiful, sometimes as large crystals, weighing from three 

 to six grains, and in good-sized groups. I noticed that the larger the 

 crystals were, the more vitreous their lustre and the less their transpar- 

 ency. They generally occur in vertical veins, at right angles to those 

 of the calcite ; when they occur in geodes, they are generally in cavities 

 in the trap. This place is a new locality for Hayesine, which has, so far 

 as I know, never been observed in any other place than in South America, 

 and there mixed with gypsum and alum. About half a grain was se- 

 cured here by scraping the cavity. On chemical examination it was 

 found to be a borate of lime, containing but a mere trace of silica 

 (derived probably from the scrapings of the cavity), z. e. Hayesine. The 

 analysis used up nearly all obtained of this interesting mineral, and I 

 am now eagerly seeking for more to verify my results. 



Thomsonite has been reported at Bergen Hill, but I have never ob- 

 served it. 



Pectolite. Most of this species found here is a stellated variety, in 

 which the fibers diverge at a greater angle than 45°. The fibers are 

 rarely over two inches long. Masses weighing as high as three and 

 even four pounds haveljeen frequently found, and more or less is taken 

 out every day, sometimes in beautifully perfect specimens, 



Analczte. A few specimens have been obtained in fair sized crys- 

 tals, occurring with dog-tooth spar ; but it is far from being abun- 

 dant. 



Apophyllite has been quite abundant, generally in white crystals, 

 more or less perfect — occasionally pink. In one case, a pocket was met 

 with, containing, besides some white and pink apophyllite, a little of a 

 pure purple tint. It seldom occurs alone, but usually with calcite, 

 datholite and stellar pectolite. 



Prehnite'xs quite abundant in traces, never in large crystals, contrary 

 to the conditions in the Pennsylvania railroad cut. It generally occurs 

 in small cavities, and sometimes with calcite in some of the veins. 



Sphene is met with in very small quantities, disseminated through 

 the harder trap. 



Stilbite. But little stilbite has been found, and that descending from 

 some fissures into the natrolite. 



Natrolite. This has been remarkably abundant. It has been 

 found in groups of every shape, and in various sized crystals, sometimes 

 in nearly perfect globes fully two inches in diameter, with druses, 

 geodes, and other forms of great beauty and perfection. Most of it 

 has been taken out m plates four or five inches square, and about five- 

 eighths inch thick, coming from a bed spread over a large distance. 



