Molybdenum is sulfur’s stable mate
Unfractionated isotopes preserved
Like genteel Dr Jekyll, sometimes fate
Disrupts the inner peace that is deserved.
When oxygen attacks stable sulfide
Molybdenate and sulfate are dissolved
Adsorption onto rust, like Mr Hyde
Wreaks horrid fractionation, unresolved.
The speciation in a rock controls
If seawater Mo isotopes remain.
A moly oxide, even in black coals
May fractionate the isotopes again.
The near adsorption
edge of XANES can tell
If moly isotopes
have gone to Hell.
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