A mineral containing didymium or having twinned crystal structures, related to rare earth minerals.
From 'didym-' (relating to didymium or twinned structures) plus '-lite' (mineral), following mineralogical nomenclature where '-lite' indicates a stone or mineral.
Mineral names ending in '-lite' are often misnomers—'didymolite' might have been named for containing didymium or appearing didymous, but many such minerals were renamed once chemists realized what they actually contained, leaving confusing fossils in mineralogical literature.
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