locality,
known as " The Glen," is 9 miles north by east of Emmaville, and the
guidebook states that a considerable quantity of emeralds was obtained
there some years ago, but that the pegmatite dike, in which they were
found, was lost or cut out at the 50-foot level. Systematic search
might recover it, and there are other similar dikes in the vicinity
which should also he prospected for emeralds. These dikes are offshoots
from a large granitic mass intruded among claystones, which are thought
to be of Carboniferous age. The dike that yielded the emeralds was a
small one, varying in width from a few inches to 4 feet, and also in
character from a typical " greisen " at some points to a pegmatite at
the gem locality.
BERYL.
CALIFORNIA.
Mr.
H. C. Gordon reports the finding of some magnificent groups of pink
beryl crystals, measuring 1-1/2 inches in diameter, of the flat type of
crystal, rich pink in color, but attached to albite rock, in the
Esmeralda mine, Mesa Grande, San Diego County, Cal.
NORTH CAROLINA,
Mining
for beryl has been carried on more or less extensively in North
Carolina, but without much result. It was found, however, in the
Spruce Pine region that by deeper mining blue beryls were frequently
obtained at a greater depth than any previously taken out, and in some
quantity. Many gems have been obtained weighing from three-fourths of a
carat to 2 carats each, but few are over 4 carats in weight.
TOPAZ.
CALIFORNIA.
The white and blue topazes from the Ramona district, San Diego County, Cal., described in the report of this Bureau for 1904,a
were well represented in the gem exhibit of San Diego County at the
Lewis and Clark Exposition, at Portland, Oreg., in 1905. Large
specimens of the associated minerals—albite, ortho-clase, garnet,
tourmaline, etc.—were displayed, showing the topaz in its natural
environment, and then as separate crystals and as cut gems..
AUSTRALIA.
Mr.
C. Anderson, mineralogist of the Geological Survey of New South Wales,
gives some further accounts of the topaz occurrences in that colony and
also in Tasmania,b described by him in the previous volume
of the Records and noticed in the report of this Bureau for 1904. The
article is mainly crystallo-graphic, describing and illustrating some
particularly fine examples recently obtained from the several
localities before reported. No additional facts of any importance are
given concerning the mode of occurrence, as previously described, at
Emmaville and Oban, in New South Wales, and at Mount Cameron, Flinders
Island, and Bell Mount, Tasmania, save the mention of the existence of
pale pink and yellow varieties in Tasmania, which had been reported as
not found there. Some of the crystals from Flinders Island,
Killicrankie Bay, are of remarkable size, up to several inches in
diameter.
a
Mineral Resources U. S. for 1904, U. S. Geol. Survey, 1905. pp.
979-982, b Rec. Austral. Museum, vol. 6, pt. 2, Sept. 15, 1905, pp.
S:S-S9.
