How does on go about this? I understand There is a +5 charge distributed on 3 copper ions. So either we have 2+, 2+ and 1+ or 3+, 1+, and 1+. Judging from the structure there are to unequivalent types of Cu ions. But how does one determine which is which and if the formal charges are +2 and +1 or +3 and +1 respectively

Any help is appreciated enter image description here

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    $\begingroup$ You don't, really. Oxidation state is just a formalism. The positive charges on copper are likely delocalized. $\endgroup$ – Oscar Lanzi Mar 28 '19 at 14:04
  • $\begingroup$ You're talking about *oxidation states, not formal charges... $\endgroup$ – Mithoron Mar 30 '19 at 1:04