of
about 14,000 feet, in a region of almost perpetual snow, which is
accessible for only a short period during the summer. Hundreds of
crystals have been found attached to and implanted on quartz crystals,
transparent beryl, and Baveno twin crystals of orthoclase feldspar. The
largest crystal found measured over 1 inch across and was nearly 1 inch
long. The crystals are nearly all quartzoids or simple rhombohedrons.
(See Fig. 5.) Some have a faint wine-color and others a smoky, bluish
tinge. Some smoky quartz crystals, with crystals of phenacite in the
center, were observed. In May, 1888, E. A. Andrews, of Stow, Me.,
discovered some crystals of phenacite on Bald Mountain, North Chatham,
N. H., near the State line between Maine and New Hampshire, and in the
neighborhood of Stoneham, Me. They were found in a vein of coarse
albitic granite,1 associated with crystals of smoky quartz,
topaz, and muscovite, some implanted on smoky quartz, a few attached
so loosely to the matrix by one of the rhombohedral faces that they
could be removed without being broken. They were about fifty in
number, lenticular in shape, and measured from 1/8 inch to 1/2 inch (3
millimeters to 12 millimeters) across, and from 1/25 inch to 1/8 inch
(1 millimeter to 3 millimeters) in thickness. They were all white or
colorless, with polished faces, and for the most part very simple in
form. The series from Pike's Peak, Col., has been described by Prof.
Samuel L. Penfield." Few of the phenacites found in the United States
have been cut into gems, but several thousand dollars' worth have been
sold as mineralogical specimens, and now adorn the cabinets of the
world.
Mention
is made of euclase in the United States as follows : Several crystals
were reported as having been found at Mills's Spring, Polk County, N.
C, by Gen. Thomas L. Clingman, in washing the gold sand at this
locality, but Prof. Frederick A. Genth says3 that they were
not euclase. It was also mentioned as having been found in connection
with topaz at Trumbull, Conn., but this report proved incorrect.1 With the full series of glucinum found in this country, it is not unlikely that euclase
1 Am. J. Sci. in., Vol. 27, p. 212, March, 1884.
2 Am. J. Sci. III., Vol. 33, p. 131, Feb., 1887.
3 Minerals and Mineral Localities of North Carolina, p. 54, 1881. J Am. J. Sci. I., Vol. 43, p. 366, July, 1842.
