What caused the weight of an iron rich rock powder to increase after doing LOI?

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Emanuel Cooper

Most likely oxidation, probably Fe(2+) reacting with oxygen and going to Fe(3+). If you weigh (again) after heating and cooling the answer is less certain because some minerals will also absorb (or reabsorb) water and/or CO2 under these conditions.

J. M. Sanchez

Fully agree. Fe is likely in Fe2+ oxidation state. Therefore, oxidation can proceed till all iron in the rock is in Fe3+ state. This explains the mass gain.