The Collaborative International Dictionary of English v.0.48:
Opalize \O"pal*ize\, v. t. [imp. & p. p. Opalized; p. pr. & vb. n. Opalizing.] [Cf. F. opaliser.] To convert into opal, or a substance like opal. --Lyell. [1913 Webster]WordNet (r) 3.0 (2006):
opalize v 1: make opalescent [syn: opalize, opalise] 2: replace or convert into opal; "opalized tree trunks" [syn: opalize, opalise]