Has anyone come across O-isotope fractionation data for braunite?

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Brenton Fairey

Thanks Tobias - the closest thing I could find is the following paper, perhaps you may find this interesting/vaguely useful.

http://petrology.oxfordjournals.org/content/36/2/463.short

Braunite is also a bit of a strange mineral given the amount of Si it contains.... in terms of concentrations it puts braunite somewhere between an oxide and a silicate! So it is even difficult to try and relate it to fractionation curves of hematite for example.