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PRECIOUS STONES.
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North
Carolina, at Brindletown Creek, in Rutherford Co. ; at Portis Mines, in
Franklin Co., with Gold in placer workings ; at Dysortville, in
M'Dowell Co. Diamonds have also been found sparingly in Idaho and
Oregon, in the west, and in Georgia (Hall Co.). One stone of 23-3/4
carats was found at Manchester (Virginia) in 1855. It is of interest to
note that much of the rock in North Carolina consists of a schistose
rock, and that a flexible sandstone similar to the itacolumite of
Brazil is also found, though it has not yielded Diamonds so far. In
Wisconsin Diamonds have been found in glacial deposits with Quartz,
Garnet, Ilmenite, and Magnetite. It is pointed out by Professor Hobbs
that the direction of the ice movement shows that most of this glacial débris came from the neighbourhood of Hudson Bay.
In
British Guiana Diamonds have been found in gold-bearing gravels at Omai
Creek (Harrison). The gravels seem to be composed of weathered
dolerite, with Quartz and concretions of iron-stone. On the upper part
of the Mazaruni river they have been found in gold-bearing gravels
associated with Spinel, Tourmaline, Ilmenite, Topaz, and Corundum.
Diamonds
have also been found in a rock on the Sea of Tanjan in Malacca, in
Java, and in Celebes ; also at Serra Madre, in Mexico,of the variety
Carbonado. King ("Precious Stones "), quotes Ammian for a locality
known in the fourth century beyond the Sea of Azov.
Minute
Diamonds have been found in meteorites, first in one that fell at
Novo-Urei, in Russia, in 1886 ; but as this is an extra-terrestrial
origin, the reader must consult such special articles as Sandberger ("
Jahrbuch fur Minéralogie," 1889).
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