silicified

adj

1. Combined with silicon.
2. Impregnated with silica; petrified.

   “Some of the best evidence of what happened comes from Germany, where the silicified trunks of about 80 species of trees have been found preserved in what was once a great lagoon fringing the northern slopes of the rising Alps.”

verb

1. (form-of, participle, past)simple past and past participle of silicify