Taranakite
Taranakite is a hydrated alkali iron-aluminium phosphate mineral with chemical formula ( , ) 3 ( , 3+ ) 5 ( PO4 ) 2 ( HPO4 ) 6·18H2O . 
<triplet> Taranakite <subj> phosphate mineral <obj> subclass of <triplet> iron <subj> 6 <obj> oxidation state