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PRECIOUS STONES 117
The
green color is due to the iron oxide included in the composition and is
deeper as the proportion of iron is greater. Almost colorless specimens
contain much less iron and are lighter.
Few
olivines are sold as such. The beautiful bright yellowish-green stones
known here as olivines are generally demantoids, Russian green garnets
of about the same hardÂness. These are rarely found large enough to cut
to gems of over one-half to three-quarters of a carat.
Olivine is found in many countries and also in meteorites.
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