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A suite of picroilmenite megacrysts from the Dalnaya kimberlite, Siberia, was found to fall into one of two groups, the most abundant having 11-12 wt% MgO and 650-1500 ppm Nb, and the others having lower MgO (8.8-10.2 wt%) and higher Nb (1700-2700 ppm). Ferrous freudenbergite (Na 2 FeTi 7 O 16 ) crystals were found included in many of the megacrysts from the first group. The freudenbergite-bearing ilmenite megacrysts are also pervaded by micrometer-size spots that have elevated Al 2 O 3  (&gt;2 wt%), SiO 2  (&gt;0.4 wt%), and Na 2 O (&gt;0.15 wt%) contents. The low Cr 2 O 3  vs. Nb content of the second group may reflect clinopyroxene crystallization. This may be a factor influencing the lack of freudenbergite in these megacrysts.

Ferrous freudenbergite in ilmenite megacrysts: A unique paragenesis from the Dalnaya kimberlite, Yakutia