How we can define a reaction with two minerals (such as reaction 1) in Toughreact’s thermodynamic database?

I am trying to simulate the precipitation of uraninite using reactive mass transport modeling. In my reactive transport model, Uraninite precipitates through the following reaction:

UO2{2+}+2Fe{2+}+3H2O=UO2+Fe2O3+6H{+}                                 

According to this reaction, ferrous iron (Fe{2+}) acts as a reducing agent in uraninite precipitation. In order to have a reactive mass transport model that accommodates above reaction, we need to define UO2{2+}, Fe{2+}, H2O, Fe2O3, and H{+}  as components (primary species). My question is how we can define a reaction with two minerals (such as reaction 1) in Toughreact’s thermodynamic database?

Thank you very much for your help in advance,

Yousef