Minor element chemistry of hemo-ilmenite and magnetite in cumulate rocks from the Sokndal Region, South Rogaland, Norway, by Peter Robinson, Peter T. Panish, and Suzanne A. McEnroe (vol. 86, p. 1469–1476, 2001).

The convenience of plotting analyses of both rhombohedral and cubic oxide analyses on the same diagram, as explained in this paper, can come at the risk of falling into a graphical/numerical trap. Hindsight shows that we have done this in handling analyses with variable Mg contents in Figures 2, 3, and 4.

One way to make a simultaneous image of the two series is to superimpose...

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