Silicify

v. t.	1.	(Chem.) To convert into, or to impregnate with, silica, or with the compounds of silicon. [imp. & p. p. Silicified ; p. pr. & vb. n. Silicifying .] The specimens found . . . are completely silicified. - Say.
v. i.	1.	To become converted into silica, or to be impregnated with silica.