The Collaborative International Dictionary of English v.0.48:

Jasperize \Jas"per*ize\, v. t. [Usually p. p. Jasperized (?).]
   To convert into, or make to resemble, jasper.
   [1913 Webster]

         Polished specimens of jasperized and agatized woods.
                                                  --Pop. Sci.
                                                  Monthly.
   [1913 Webster]