
Researchers picked oyster, mussel and cockle shells off Irish beaches, crushed the 3 kinds of shell into grains, and dropped them into water carrying rare earth metals at concentrations similar to badly polluted industrial runoff. The oyster grains took up as much as roughly 1.5 grams of metal for every gram of shell.
Discarded oyster shells absorb rare earth metals at rates exceeding their own weight, suggesting an unlikely solution to cleaning up industrial contamination.














