The Collaborative International Dictionary
Jasponyx
Jasponyx \Jasp`o"nyx\, n. [L. iasponyx, Gr. ?. See Jasper, and Onyx.] (min.) An onyx, part or all of whose layers consist of jasper.
Wiktionary
jasponyx
n. (context mineralogy English) A form of onyx, part or all of whose layers consist of jasper.