noun Crystallography.
the ability of certain different elements to exist in place of each other in certain points of a space lattice; isomorphism.

irregular < Greek diadochḗ succession; see diadochokinesia

diadochic [dahy-uh-dok-ik] , adjective
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World English Dictionary
diadochy (daɪˈædəʊkɪ)
geology the replacement of one element in a crystal by another
[C20: from Greek diadochē succession]

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