Abstract
The crystal structure of molybdomenite (PbSeO 3 ) from El DragOn mine (Bolivia) was refined in the space group P2 1 /m, using single-crystal X-ray diffraction data, to R F =0.049. The refined unit cell parameters are a = 4.5437(7), b = 5.5137(8), c = 6.634(1)A, β = 106.547(7)°. Molybdomenite is the lead selenite and is isostructural with scotlandite, the lead sulphite, PbSO 3 , with Se 4 + playing the same role of S 4 + in the latter. The structure of molybdomenite can be described as stacking of complex structural slabs along (100). In molybdomenite lead is nine-fold coordinated (average Pb-O 2.78 A) and selenium form a trigonal pyramid with three oxygens (average Se-O 1.71 A).
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