silicification

noun
si·lic·i·fi·ca·tion | \ sə-ˌli-sə-fə-ˈkā-shən \

Definition of silicification 

: the action or process of silicifying : the state of being silicified

First Known Use of silicification

1830, in the meaning defined above

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The first known use of silicification was in 1830

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