1891. ] NEW YORK ACADEMY OF SCIENCES. 51 
three feet in width. The mica of the granite was muscovite, 
often in imperfect crystals seven inches across and as much in 
thickness. ‘The smoky quartz and orthoclase occurred in cor- 
respondingly large masses, the orthoclase sometimes being 
crystallized. 
The garnets were most plentiful at the junction of these two 
minerals, usually upon a face of an orthoclase crystal. The 
garnet faces in the orthoclase were generally flattened, as the 
numerous shallow casts on the specimens here indicate. Crys- 
tals froin the smoky quartz were fewer, but much lighter in color 
and more translucent. Some of the groups are very beautiful. 
One consists of fifty-nine crystals about three-eighths of an inch 
in diameter, and nearly as many more casts, on a part of an ortho- 
clase erystal ten by eight by four inches. 
An interesting feature of the garnets was their crystalline 
form. They were the combination of the trapezohedron trun- 
cating the rhombic dodecahedron, the faces of each being about 
equally prominent. The largest crystal was one and a quarter 
inches in axial diameter. Few were less than one-quarter of an 
inch. One specimen on the table shows faces of the hexocta- 
hedron, in addition to those before mentioned, thus giving the 
crystal ‘the appearance of rounded edges. 
As the blasting continued the character of the granite chan ged. 
The muscovite was smaller, and oligoclase in masses nearly as 
large as the orthoclase became common. The garnets were 
scarcer, and their crystalline form was generally the unmodified 
trapezohedron. ‘lo my knowledge no simple dodecahedrons 
were founda. 
The blasting was shortly discontinued, and was only recom- 
menced a short time ago. Garnets were, however, comparatively 
- fewand imperfectly crystallized trapezohedrons. While search- 
ing, with the hope that some good garnets might still remain, a 
half-inch beryl was found, and shortly afterward a large jointed 
crystal in all some ten inches long. It was impossible to get 
this crystal out whole. The best piece is upon the table. The 
crystal was intersected at the joints by seams of quartz, remind- 
ing one of many tourmaline crystals of this city. Although not 
clear or colored enough to be called emeralds, fractures and 
splinters show them to be quite glassy and translucent. 
Besides the minerals already mentioned, some tourmaline and 
a small black crystal in orthoclase, possibly columbite, have been 
taken from this vein. 
I am inclined to think the vein metamorphic in its origin, and 
it evidently cooled slowly and with but little disturbance. 
