Fork
of Arkansas Eiver. These garnets occur in cavities in altered granitic
rock and make good specimens. They are of gem quality, but too small
for cutting. Mr. Endicott also obtained a quantity of specimens of
spessartite garnet from the "Ruby Mountain" locality across Arkansas
River from Nathrop. These garnets occur in cavities in rhyolite
associated with topaz and other minerals. The topaz also occurs in good
crystals and makes fine specimens.
JASPER.
MONTANA.
Specimens
of Montana jasper have been furnished by Mr. J. H. Mosner, of Glendive.
One variety is composed of dark-yellow jasper, in which are turtle-back
markings of gray chalcedony and a little metallic hematite with a few
patches of bright-red jasper scattered through the specimen and in a
broad band along one side of it. The pattern and colors displayed by a
gem cut from this material are very pretty. Another variety which Mr.
Mosher calls mahogany jasper has a dark-reddish mahogany color with
peculiar patches and irregular streaks of darker color resembling the
grain of wood.
CALIFORNIA.
The
spherulitic jasper-like quartz from the San Francisco region described
in this report for 1910 is being cut with good results. The trade name
"kinradite" was proposed in acknowledgment of Mr. J. J. Kinrade's part
in bringing this unique gem before the public. There is considerable
variation in color and size of markings in different specimens, but
the beautiful radial structure of the red spheru-lites is visible in
most gems. Probably the most common type of stone consists of
bright-red spherulites in dark-greenish and reddish-brown matrix. An
attractive stone is cut from material in which the red spherulites are
scattered through an ocher-yellow matrix. Mr. Kinrade says the best
specimens are found between Point Bonita and Fort Baker in the southern
end of Marin County. Another locality is near Lands End station about 1
mile northeast of the Cliff House in San Francisco County. "Kinradite"
is also found at other places along the coast of California as far
north as the Oregon line.
Bloodstone.—Specimens
of bloodstone and notes on the occurrence have been furnished by Mr. F.
M. Myrick, of Randsburg, Cal., from a new locality discovered by him in
San Bernardino County. The stones were found on Brown Mountain in the
Death Valley region, about 15 miles north of the St. Stephen stone
locality mentioned above. Several pits have been made, the largest of
which is 15 feet long, 10 feet wide, and 12 feet deep. The bloodstones
are found in a claylil:e formation in "malpais" over an area 800 feet
long and 200 feet wide. They occur in bunches or pockets containing
from a few pounds to more than 30 pounds. The color and quality of the
bloodstone found at the surface are as good as those from a depth of
12 feet. Several hundred pounds of rough stone have been mined and a
quantity of select material placed on the market.
The
mineral is true bloodstone or heliotrope composed of slightly
translucent dark leek-green plasma through which bright blood-red
