crustation

noun
crus·​ta·​tion | \ˌkrəˈstāshən\
plural -s

Definition of crustation 

1 : the act or process of forming a crust soil crustation

2 : a thin coating or layer : deposit

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History and Etymology for crustation

Latin crustatus (past participle of crustare to cover with a shell, from crusta shell) + English -ion

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