Philoxenite [ (K,Na,Pb)4(Na,Ca)2(Mg,Cu)3(FeIII0.5Al0.5)(SO4)8 ]

Composition

Element Atoms
Fe 0.5
Mg ~1.5
Ca ~1
Al 0.5
S 8
Cu ~1.5
Na ~2.333
K ~1.333
Pb ~1.333
O 32