Molybdomenite has been found at the Ranwick Uranium Mine, where it occurs as small white to colourless blades closely associated with clausthalite. Molybdomenite has been synthesized and its chemical formula is established as PbSeO 3 . The mineral is monoclinic with space group P2 1 or P2 1 /m. Unit cell parameters are:a=6.86, b=5.48, c=4.50 (all in A), beta =112 degrees 45', Z=2.

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