Coupled substitution

Example on bottom where albite (Na Al Si3O8) changes to anorthite (Ca Al2Si2O8), Al3+
replaces Si4+
and Ca2+
for Na+

Coupled substitution is the geological process by which two elements simultaneous substitute into a crystal in order to maintain overall electrical neutrality and keep the charge constant.[1] In forming a solid solution series, ionic size is more important than ionic charge, as this can be compensated for elsewhere in the structure.[2]

  1. ^ Cite error: The named reference wolfram was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference diction was invoked but never defined (see the help page).

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