Trans. N. Y. Ac. Sce. 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 
inthetrap. This placeis a new locality for Hayeszue, 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. 
Thomsonzte 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 have been frequently found, and more or less is taken 
out every day, sometimes in beautifully perfect specimens, 
Analcite. A few specimens have been obtained in fair sized crys- 
tals, occurring with dog-tooth spar; but it is far from being abun- 
dant. 
Apophylizte 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 aad pink apophyllite, a little of a 
pure purple tint. It seldom occurs alone, but usually with calcite, 
datholite and stellar pectolite. 
Prehnite is 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. 
Stzlozte. But little stilbite has been found, and that descending from 
some fissures into the natrolite. 
Natroltte. 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 in plates.four or five inches square, and about five- 
eighths inch thick, coming from a bed spread over a large distance. 
