Coupled substitution
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Coupled substitution is the geological process by which two elements simultaneously substitute into a crystal in order to maintain overall electrical neutrality and keep the charge constant. In formin
Example on bottom where albite (Na Al Si3O8) changes to anorthite (Ca Al2Si2O8), Al3+ replaces Si4+ and Ca2+ for Na+
Diopside can be converted into
Jadeite by coupled substitution
Edenite
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Edenite or edenitic hornblende is a double chain silicate mineral of the amphibole group with the general chemical composition NaCa2Mg5O222. Edenite is named for the locality of Edenville, Orange Coun
Edenite crystal from Bancroft District, Ontario