sete 
of New-York and New-Jersey, &e. = 9. 
‘green surface ascertained by Dr. Torrey to be chlorite. — 
The layers beneath the amygdaloid are red and gray con- 
glomerate connected with red sandstone, too porous for use, 
as it absorbs much moisture and is broken by the expan- 
Sive power of frost. Good freestone, in nearly horizontal 
position, is the basis layer and forms the bed of the Passa- 
ic. In many places the greenstone occupying the summit 
appears buta few feet in thickness. The greenstone of 
Patterson does not present columns assimilating to basalti- 
form regularity. On the bank of the Passaic, adjacent to 
the first manufactories, [ observed a well defined hexaedral 
column of fine grained greenstone, a loose mass, about five 
feet in length by two in diameter ; by the aid of a magnifier 
y! greenstone compositionis apparent. Before the autumn of 
818,prehnite, cal r, and carbonate of copper were 
the only minerals observed imbedded in the greenstone ran- 
ges adjacent to Patterson—at that period I met with, near 
the falls, superior specimens of zeolite, stilbite, analcime, 
and datholite, together with fine masses of prehnite ; ame- 
thyst has been since discovered by Judge Kinsey, and Mr. 
J.1. Foote, residents of Patterson—to these gentlemen I am 
indebted for many useful facts. Prehnite I obtained in 
¢c a | _ ; th 
considerable lustre is reflected from narrow polished planes; 
the colour in general a delicate light apple green, = in 
0 
‘Some specimens it is darker than the emerald.—It is und 
imbedded in greenstone at the falls 
a ‘The zeolite of Patterson is white, aggregated in fascicu- 
lar sroups of delicate diverging fibres, and presenting de- 
eS Sec ae, ee ee a Oe 2 f vari 5 1; i ,some- 
