I'm given Co(Cl)2 * 6(H2O)$\ce{CoCl2*6H2O}$ as well as (Na3)(PO4) * 12(H2O)$\ce{Na3PO4*12 H2O}$
The chemical formula for Cobalt Violet is (Co3)(PO4)2$\ce{Co3(PO4)2}$. I haven't done stoichiometry in a long time but I think that's creatable, right?
Some website says that I need Na(H2)(PO4)·10(H2O)$\ce{NaH2PO4·10H2O}$, instead of the Sodium phosphate dodecahydrate which is what I have.