| http://www.w3.org/ns/prov#value | - With respect to compound 3Me(II)O???R2O3???Me(II)(anion)2???nH2O wherein R2 is Al2, Fe2 or Cr2, anion is NO2, NO3 or OH and n is 0 to 24 where Me(II) is a cation such as Ca, but may be partially substituted by other divalent cations or may be completely substituted by other divalent cations such as Ba, Sr, Mn, Zn, for example.
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