Abstract
Titanium magnetite and ilmenite begin to crystallize first, but most of these minerals come down concurrently with ferrohedenbergite, after phenocrysts of olivine have already appeared. Crystallization of the ferromagnetic minerals ceases upon solidification of the glass. Evolution and order of crystallization of the magmatic melt itself are indicated by different states of oxidation and decay of the ferromagnetic minerals captured by phenocrysts of olivine, ferrohedenbergite, and sanidine. A primary magnetic origin of independent grains of ilmenite is suggested by their abundance and shape, but thermomagnetic evidence indicates that some of them are products of degradation-oxidation of titanium magnetite.
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