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Chrysoprase.
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and
that the stone contained a small quantity of water. The nickel oxide is
therefore, probably united with water, as hydrate, in the Chrysoprase,
and if by the influence of heat, some of the water in the stone is
lost, the beauty of the colour may be more or less destroyed.
At
Oberstein a green colour is imparted to ordinary Chalcedony, by means
of salts of nickel or of chromic acid so as to produce an artificially
tinted Chrysoprase.
CHRYSOPRASE.
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