be occasionally found with aragonite of
a light pearly gray color and rhombohedral crystals. As before noticed,
Staten Island is the best locality for this species.

_Calcite_.--In places the limestone is perfectly crystallized, and of a
pure white or other color, when it forms an attractive mineral, and
often worth removing. The limestone of the main quarry, carefully
averaged, was found to have the following chemical composition.

Lime. 11.09
Magnesia. 37.94
Carbonic acid. 30.61
Silica. 10.22
Water and loss. 4.90
Iron and alumina. 5.24
------
100.00

In places it is spotted with the serpentine, and judging from its rough
state resembles "_verde antique_," and at that of a beautiful color;
samples of this should be obtained.

_Feldspar_.--This mineral occurs very plentfully in the space between
the limestones and gneiss. It is generally of a flesh red color and
often in very perfect crystals, in some instances an inch and a half in
length; as its hardness is 6, it can be readily distinguished from
calcite, which it much resembles, but which has only a hardness of 3,
and dissolves with effervescence in acids.

A visit to this locality is a delightful manner in which to spend a
holiday or other time of leisure; and as it affords so many interesting
and valuable minerals, it forms a very profitable trip as well. In
reaching it many interesting localities are passed, and if one has an
early start these may all be visited. I will describe a few of these,
which are alike possessors of beautiful scenery and instructing
geological features and not far from the main line of travel.

Starting from the Erie depot, on the Greenwood Lake road, the first stop
may be at Arlington, about seven miles west of Jersey City. Here a visit
to the Schuyler copper mine may be profitably taken; and as I have
written a full account of this locality in a previous portion of these
articles,[1] I will not reiterate it here, but refer to that paper. The
mine, I might add, is only a mile north of the railroad station, and on
Schuyler Avenue, a short distance north from its junction with the
Jersey City and Paterson turnpike. Coming back to Arlington depot, and
walking on the track for about a quarter of a mile west through the deep
cut, the manner in which the sandstones and shales which constitute so
large a portion of New Jersey