The Collaborative International Dictionary
Porcelanite
Porcelanite \Por"ce*la*nite\, n. [Cf. F. porcelanite.] (Min.) A semivitrified clay or shale, somewhat resembling jasper; -- called also porcelain jasper.
Wiktionary
porcelanite
n. (context mineralogy English) A semivitrified clay or shale, somewhat resembling jasper; porcelain jasper.