Abstract
Thai gem corundums fall into two discrete populations on the basis of their trace element fingerprinting. Sapphires are rich in Ga (up to 0.101 wt % Ga2O3) and poor in Cr (<0.053 wt% Cr2O3) whereas rubies are rich in Cr (up to 0.564 wt% Cr2O3) and poor in Ga (<0.009 wt% Ga2O3). The trace element study of corundums from well-characterized geol. environments suggests that Thai sapphires crystd. from syenitic gneiss metasomatized by a highly evolved magma such as carbonatite. Rubies could have crystd. in a metamorphic environment probably in a pre-existing metamorphic rock with mafic compn. [on SciFinder (R)]
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