PLATE XII. 
Fig. 1. 
Fig. 2. 
Fig. 3 
Fig. 4, 
Scalenohedrons of Calcite parasitic on crystals of Natrolite. 
From the exterior of a spheroidal aggregation solid within. A specimen 
from Great Notch, N. J., in the collection of Mr. James G. Manchester, 
of New York. Photomicrograph. Enlarged 4f diameters. The re¬ 
sulting solid resembles massive natrolite, but evidently contains much 
calcite, thus inclosed. Collected in July, 1909. 
. Natrolite and Prehnite supporting sequent Calcite. 
The resulting solid natrolite will consist largely of inclosed calcite. Col¬ 
lected Nov. 16, 1895. 
. A filamentary mineral on a thin coating of Diabantite on trap and sup¬ 
porting parasitic crystals of various minerals. Snake Hill, N. J. 
The larger and more conspicuous of these are rhombohedrons of calcite. 
Photomicrograph. Magnified diameters. 
. A filamentary mineral in a cavity between crystals of Datolite and 
Calcite. Erie Cut, Bergen Hill, N. J. Photomicrograph. Magnified 
3£ diameters. 
The filaments support parasitic crystals of various minerals, the larger and 
more numerous of which are datolite. Collected February 27, 1909. 
