Abstract
Electron-microprobe analyses of magnetoplumbite (formally PbFe 12 O 19 ) from La˙ngban-type deposits in the Filipstad district, Sweden, demonstrate that the mineral is highly variable in composition with ranges: PbO 16.1-19.8, BaO 0.1-1.5, Sb 2 O 5 0.0-9.0, ZnO 0.0-2.1, Fe 2 O 3 37.0-64.0, MnO 2.8-9.2, Mn 2 O 3 0.0-22.7, Cr 2 O 3 0.0-1.0, TiO 2 0.0-10.2, Al 2 O 3 0.0-2.6, MgO 0.1-0.8 (all in wt.%). The major mechanisms of substitution are Mn 3+ = Fe 3+ , Mn 2+ + Ti 4+ = 2 Fe 3+ and 2 Mn 2+ + Sb 5+ = 3 Fe 3+ . Ba is the only significant substituent for Pb with up to 0.12 atoms pfu, and the ratio between large and small (interstitial) cations is ideal within the analytical error limits
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