from
The Collaborative International Dictionary of English v.0.48
Silicify \Si*lic"i*fy\, v. t. [imp. & p. p. {Silicified}; p. pr.
& vb. n. {Silicifying}.] [L. silex, silicis, a flint + -fy:
cf. F. silicifier.] (Chem.)
To convert into, or to impregnate with, silica, or with the
compounds of silicon.
[1913 Webster]
The specimens found . . . are completely silicified.
--Say.
[1913 Webster]
Note: The silica may take the form of agate, chalcedony,
flint, hornstone, or crystalline quartz.
[1913 Webster]