Today most synthetic malachites are produced in Russia. Visual identification may be difficult because they are virtually indistinguishable except by destructive /analytical tests, but the SG (specific gravity) values aren't the same.
Natural malachite = 3.87 – 3.92
Synthetic malachite = 3.61 – 3.70
Malachite
http://en.wikipedia.org/wiki/Malachite
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