Silicify
Silicify , transitive verb
[Latin silex, silicis, a flint + -fy: compare French silicifier.]
(Chemistry) To convert into, or to impregnate with, silica, or with the compounds of silicon.
The specimens found... are completely silicified.
The silica may take the form of agate, chalcedony, flint, hornstone, or crystalline quartz.
Silicify , intransitive verb
To become converted into silica, or to be impregnated with silica.