Why there are two colours in the carbonate rhomb in a BIF sample?

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The sample is a BIF thin section viewed under PPL. A rhomb-shaped mineral, likely ankerite, appears in two colours. Could this be due to compositional zoning between two different carbonates (one red, one colourless, reflecting fluctuating conditions), or is it a single crystal showing partial oxidation, with the red colour resulting from alteration in certain zones?

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