beryl and its probable relation to the formation of the two associated beryllium minerals—bertrandite and phenacite.
Beryl
crystals have been found rather plentifully at the Amazon claim of J.
D. Endicott, 6-1/2 miles north of Texas Creek on East Gulch, Fremont
County, Colo. The country rock at this mine is contorted mica and
hornblende gneiss. The gneiss is cut by a large irregular mass of
pegmatite which outcrops as a small cliff on the west side of the
valley. The pegmatite contains irregularly shaped quartz masses of pale
rose color, ranging from a few inches to several feet across. Beryl
crystals are exposed at six or eight places in the cliff and range from
less than an inch to a foot in diameter. They are mostly opaque and
yellowish to greenish in color. Indications of gem quality were seen in
fragments of one crystal, and a few gems have been cut. Mica occurs in
crystals 4 and 5 inches across, and a few crystals of columbite are
found.
PENNSYLVANIA.
Dr.
Edgar T. Wherry, of Lehigh University, states that beryl is found at
many places in Chester and Delaware counties in southeastern
Pennsylvania. The best locality is probably at the quarry of C. J.
Leiper, at Avondale, Delaware County. The beryls are found here in
pegmatite cutting the coarse granitic Baltimore gneiss. The beryl
crystals range in size up to 2 inches in diameter and 4 inches in
length. They have a bright green to golden-yellow color, though the
majority are badly flawed and opaque. Occasionally clear crystals of
gem quality are obtained. In the fall of 1908 some rusty beryl crystals
were found about half a mile to the north of this place during the
grading of a road. Good specimens are expected when the locality is
opened as a quarry for building stone, as is the present intention.
Almandite garnet is found with the beryl at some of the localities and
in some cases is suitable for cutting into gems.
UTAH.
Maynard
Bixby, of Salt Lake City, reports the discovery of a new beryl locality
on lbapah Mountain in Tooele or Juab counties, western Utah. The beryl
has a blue color with patches of gem quality. Details of the find are
lacking, though it seems the beryls were found in gulch gravels and not
in place.
NEW HAMPSHIRE.
Edwin
Passmore, of Boston, Mass., reports the discovery of a ledge carrying
light-green, light-yellow, and golden-colored beryl near Danburyv
N. H. A portion of a broken crystal of dark yellow color found at this
locality was valued at about $150. The crystals are associated with
massive feldspar and will have to be removed with care to prevent
breaking.
NORTH CAROLINA.
The
Virginia-Carolina Gem Company of Shenandoah, Va., reports prospecting
work on its aquamarine deposit near Mica, Mitchell County, N. C. The
mine adjoins the property of the American Gem and Pearl Company and is
probably the old Hungerford mine.
