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It is repeated often that Saharan calimas are fertilizing often Atlantic ocean. But I suppose that most of Saharan dust contains Fe2O3 and not FeO. Am I right?

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I think you are correct. Typical sand is silica (white) with a little Fe2O3 (red) to give a "sand" color. FeO is black and over geological time in air, oxidizes further to Fe3O4 with hydroxides and hydrates (black and dark brown) and eventually Fe2O3.

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    $\begingroup$ Let me just add that "FeO" probably doesn't even exist in the top few tens of kms (or maybe even hundreds of kms) of the earth. It is common as a component in other minerals (such as fayalite olivine) but never on its own. Fe2O3 on the other hand, is a common mineral: hematite. $\endgroup$ – Gimelist Aug 12 '17 at 22:48

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