Fig. 1 
Fig. 2. 
Fig. 3. 
Fig. 4. 
PLATE XL 
. Calcite, Upper Montclair, N. J. Natural size. From the collection of 
Mr. George E. Ashby of N. Y. 
The faces of the interior crystal are comparatively smooth but are formed 
only of a thin film perforated with minute holes within which it con¬ 
sists chiefly of thin parallel plates with intervening spaces partly filled 
with a loose dark colored powder which may be washed out leaving them 
vacant. Surrounding this interior crystal is a much less corroded en¬ 
velope with terminations in fair condition. The specimen was found as 
shown in the illustration with both envelopes partly removed, disclos¬ 
ing its internal structure. The small projection on the left is stilbite 
to which it was attached (compare Plate XIII, Fig. 2.) 
Prehnite, Hoxie’s Quarry, Paterson, N. J. 
A specimen which projected from the side of a cavity. The side shown 
was the under side and is unsullied. The opposite side is sullied with a 
coating of sediment partly included. Collected June 23, 1892. 
Apophyllite parasitic on Pectolite, Snake Hill, N. J. 
Photomicrograph. Magnified 4 diameters. Both minerals apparently are 
in process of deposition. The resulting solid mass resembles pectolite, 
but consists largely of included apophyllite discernible all through it. 
Collected May 30, 1899. 
Gmelinite, Calcite and other minerals. 
These are supported on and between acicular crystals of pectolite ap¬ 
parently in process of deposition, thus resulting in a solid mass re¬ 
sembling pectolite but including all these minerals. Photomicrograph 
Magnified 4 diameters. Collected May 30, 1899. 
