%silicify%

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 ]

☞ The silica may take the form of agate, chalcedony, flint, hornstone, or crystalline quartz. [ 1913 Webster ]